Research experience

•        As CSIR JRF/SRF (NET) in the Plant Virus lab, CSIR-NBRI, Lucknow, India: 1993-1998
•        As postdoctoral fellow in the lab of Dr. Yedidya Gafni, Israel: 1999-2000
•        As postdoctoral fellow in the lab of Dr. S.B. Gelvin, Purdue University, USA: 2000-2001
•        As DBT overseas associate at the University of Basel, Switzerland. Worked on “Characterization of the role of Werner exonuclease like protein genes and their promoters in suppression of silencing by MYMV AC2protein” Prof. Thomas Hohn and Prof. Mikhail Pooggin; 2005-2006;
•        Visited the lab of Prof. Maria L Garcia, University of La Plata, Argentina with regard to DST sponsored project on citrus viruses: 2008 for 3 weeks
•        Associated with Italian and Hungarian groups for implementation of projects dealing with viral pathogens of pome and stone fruits 
•        Currently handling Indo-French collaborative project with Plant Health Institute of Montpellier, France on “Circulative transmission of tomato leaf curl virus by whitefly Bemisia tabaci”, 
•        Industrial project to understand the mechanism of disease induction by seaweed extracts against viral pathogens 

Key scientific achievements:

(i)              Developed simplex and multiplex diagnostics for virus and virus-like pathogens of apple, cherry, grape, and also their latent tree reservoirs.

(ii)            Seaweed extracts have the potential to impart tolerance to plants against viral pathogens 

(iii)           Small HSP of whitefly has a role in transmission of apple scar skin viroid

(iv)           Homeobox 27 TF overexpression imparts tolerance to Cucumber mosaic virus

(v)            Sterility mosaic of Pigeonpea is due to mixed infection of two Emaraviruses (negative sense RNA) having 4 and 6 genomic components 

(vi)           Insect mediated active transmission of Apple scar skin viroid; as an offshoot a reverse transcriptase gene was identified for biotechnology industry

(vii)          Association of apoplastic ascorbate oxidase with MP of Cucumber mosaic virus is critical for virus infection

(viii)        Tomato leaf curl Palampur virus encodes two suppressors of silencing and its association with Catalase of thehost is important for the infection process 

(ix)           MP of apple chlorotic leaf spot virus is genetically unstable due to RNAse E in E.coli system 

Shri VP Gokhale Award for significant contribution in teh area of Phytopathology, instituted by Prof. DV Gokhale, University of California, Riverside, USA and administered by Maharahstra Association for the cultivation of Science (MACS), Agharkar Research Institute, Pune (November 2016)

Complete list of publications

1.                      Savita Chaudhary, Vijayanandraj Selvaraj, Preshika Awasthi, Swati

Bhuria, Rituraj Purohit, Surender Kumar, Vipin Hallan (2023) Small heat shock protein (sHsp22.98) of Trialeurodes vaporariorum play

important role in Apple scar skin viroid transmission (Accepted for Viruses)

2.                      Anish Tamang, Mohit Swarnkar, Pawan Kumar, Dinesh Kumar, Shiv Pandey, and Vipin Hallan (2023) Endomicrobiome of in vitro and natural plants deciphering the endophytes-associated secondary metabolite biosynthesis in Picrorhiza kurrooa, a Himalayan medicinal herb (Accepted in Microbiology spectrum)
3.                      Rattan U, Kumar S, Kumari R, Bharti M, Hallan V. (2022) Homeobox 27, a Homeodomain Transcription Factor, Confers Tolerances to CMV by Associating with Cucumber Mosaic Virus 2b Protein. Pathogens (MDPI). 2022 Jul 12;11(7):788. doi: 10.3390/pathogens11070788. PMID: 35890032; PMCID: PMC9323240.
4.                      Kumar A, Sharma A, Tirpude NV, Padwad Y, Hallan V, Kumar S. Plant-derived immuno-adjuvants in vaccines formulation: a promising avenue for improving vaccines efficacy against SARS-CoV-2 virus. Pharmacol Rep. 2022 Sep 20:1–17. doi: 10.1007/s43440-022-00418-4. Epub ahead of print. PMID: 36125739; PMCID: PMC9487851.
5.                      Bhattacharjee B, Hallan V. Geminivirus-derived vectors as tools for functional genomics. Front Microbiol. 2022 Apr 1;13:799345. doi: 10.3389/fmicb.2022.799345. PMID: 35432267; PMCID: PMC9010885.
6.                      Dhir S, Mathioudakis MM, Hasiów-Jaroszewska B, Hallan V. Serological and molecular analysis indicates the presence of distinct viral genotypes of Apple stem pitting virus in India. 3 Biotech. 2021 Jun;11(6):278. doi: 10.1007/s13205-021-02798-5. Epub 2021 May 19. PMID: 34040927; PMCID: PMC8134613.
7.                      Naushin S et al.,… Hallan V, Sengupta S. Insights from a Pan India Sero-Epidemiological survey (Phenome-India Cohort) for SARS-CoV2. Elife. 2021 Apr 20;10:e66537. doi: 10.7554/eLife.66537. PMID: 33876727; PMCID: PMC8118652.
8.                      Kulshreshtha A, Roshan P, Kesharwani AK and Hallan V (2020). New record of a monopartite begomovirus and papaya leaf curl betasatellite infecting Mirabilis jalapa in Himachal Pradesh, India. Indian Phytopathology 73:821–823.
9.                      Sharma J, Purohit R, Hallan V (2020) Conformational behavior of coat protein in plants and association with coat protein-mediated resistance against TMV. Brazilian Journal of Microbiology, 1-16.
10.                    Dhir S, Vijay Laxmi  and Hallan V (2020). Development of immunodiagnostics for Apple stem pitting virus and Apple mosaic virus infecting apple in India. Indian Phytopathology

https://doi.org/10.1007/s42360-020-00305-z

1.                    Walia Y, Dhir S and Hallan V (2020). Molecular and Biological characterization of an Indian variant of Chrysanthemum stunt viroid Archives of Phytopathology and Plant Protection. Archives of Phytopathology and Plant Protection. doi.org/10.1080/03235408.2020.1868743 
2.                    Nath VS, Shrestha A, Awasthi P, Mishra AK, Kocábek T, Matoušek J, Sečnik A, Jakše J, Radišek S, Hallan V. Mapping the Gene Expression Spectrum of Mediator Subunits in Response to Viroid Infection in Plants. Int J Mol Sci. 2020 Apr 3;21(7):2498. doi: 10.3390/ijms21072498. PMID: 32260277; PMCID: PMC7177877.
3.                    Barsain BL, Purohit A, Kumar A, Joshi R, Hallan V, Yadav SK. 2020. PkGPPS.SSU interacts with two PkGGPPS to form heteromeric GPPS in Picrorhiza kurrooa: Molecular insights into the picroside biosynthetic pathway. Plant Physiology and Biochemistry. DOI: 10.1016/j.plaphy.2020.05.029
4.                    Barsain, BL, Yadav, SK & Hallan, V. (2019) Promoter and methylation status analysis revealed the importance of PkGES gene in picroside biosynthesis in Picrorhiza kurrooa. J. Plant Biochem. Biotechnol. 28, 424–436. https://doi.org/10.1007/s13562-019-00498-z
5.                    Roshan P, Kulshreshtha A, Purohit R, Hallan V. (2020)  AV2 protein of tomato leaf curl Palampur virus interacts with F-box Kelch protein of tomato and enhances phenylalanine ammonia-lyase activity during virus infection

Physiological and Molecular Plant Pathology

110, 101479

6.                    Kulshreshtha A, Kumar Y, Roshan P, Bhattacharjee B, Mukherjee SK, Hallan V (2019). AC4 protein of tomato leaf curl Palampur virus is an RNA silencing suppressor and a pathogenicity determinant. Microbial Pathogenesis 135: 103636
7.                    Bhardwaj, P., Negi, A., Sukapaka, M. et al. (2019) Production of polyclonal antibodies to the coat protein gene of Indian isolate of Apple stem grooving virus expressed through heterologous expression and its use in immunodiagnosis. Indian Phytopathology 73, 165–173 (2020). https://doi.org/10.1007/s42360-019-00190-1
8.                    Sharma, D., Kulshreshtha, A., Roshan, P. et al. (2019) Molecular characterization and infectivity analysis of a bipartite begomovirus associated with cotton leaf curl Multan betasatellite naturally infecting Rumex nepalensis in northern India. J Plant Pathol 101, 935–941. https://doi.org/10.1007/s42161-019-00295-6
9.                    Sharma, D., Kulshreshtha, A., Kumar R and Hallan V (2019) First report of natural infection of alternanthera yellow vein virus and cotton leaf curl Multan betasatellite on a new host Picrorhiza kurroa, an important endangered medicinal herb. J. Plant Pathology https://doi.org/10.1007/s42161-018-0123-x
10.                    Bhardwaj P, Hallan V (2018) Molecular evidence of Apple stem grooving virus infecting Ficus palmata. Trees

https://doi.org/10.1007/s00468-018-1752-6

1.                    Chaudhary P, Kumari R, Singh B, Hallan V and Nagpal AK  (2018) First report of potato virus M, potato virus Y and cucumber mosaic virus infection in Solanum nigrum in India. Journal of Plant Pathology https://doi.org/10.1007/s42161-018-0194-8
2.                    Chaudhary P, Kumari R, Singh B, Hallan V and Nagpal AK  (2018) Infection of potato virus S and M in tomato in North-western India. Journal of Plant Pathology (2018) 100:343 https://doi.org/10.1007/s42161-018-0057-3
3.                    Purohit R, Kumar S and Hallan V (2017) Screening of potential inhibitor against coat protein of Apple chlorotic leaf spot virus. Cell Biochemistry and Biophysics. doi: 10.1007/s12013-017-0836-z
4.                    Kumar S, Subbarao BL, Kumari R, HallanV (2017) Molecular characterization of a novel cryptic virus infecting pigeonpea plants. PLoS ONE 12(8): e0181829
5.                    Roshan P, Kulshreshtha A, Kumar S, Purohit R, Hallan V (2018). AV2 protein of tomato leaf curl Palampur virus promotes systemic necrosis in Nicotiana benthamiana and interacts with host Catalase2. Scientific Reports. 10.1038/s41598-018-19292-3
6.                    Singh, V., Singh, B., Sharma, A., Kaur, K., Gupta, A.P., Salar, R.K., Hallan, V. and Pati, P.K. (2017), Leaf spot disease adversely affects human health-promoting constituents and withanolide biosynthesis in Withania somnifera (L.) Dunal. J Appl Microbiol, 122: 153–165. doi:10.1111/jam.13314
7.                    Kumar S, Subbarao BL, Kumari R, HallanV (2017) Molecular characterization of emaraviruses associated with Pigeonpea sterility mosaic disease. Scientific Reports.10.1038/s41598-017-11958-8
8.                    Singh, R.M., Singh, D. and Hallan, V. (2017) Movement protein of Apple chlorotic leaf spot virus is genetically unstable and negatively regulated by Ribonuclease E in E. coli . Sci Rep 7, 2133). https://doi.org/10.1038/s41598-017-02375-y
9.                    P Roshan, A Kulshreshtha, V Hallan (2017) Identification of host cellular targets of AC4 and AV2 proteins of tomato leaf curl palampur virus and their sub-cellular localization studies. Virus Disease 28 (4), 390-400

1.                    Kumari R, Kumar S, Singh L and Hallan V (2016) Movement Protein of Cucumber Mosaic Virus Associates with Apoplastic Ascorbate Oxidase. PLoS ONE 11(9): e0163320. https://doi.org/10.1371/journal.pone.0163320
2.                    Sharma S, Kumari R, Kumar S, Singh N and Hallan V (2016) Characterization of Cucumber mosaic virus isolates from Valeriana jatamansi, a medicinal herb in India. J. Plant Pathology 98: 182.
3.                    Sharma A, Singh L, Roshan P, Hallan V (2016) Complete Nucleotide Sequence of Ageratum enation virus and an Alphasatellite infecting a new host Glycine max in India. J. Phytopathology 164: 554-557
4.                    Kondakova O, Gavryushina E, Hallan V, Drygin D (2016) RNA isolation with low toxic ammonium trichloroacetate. Eur. J. Biosciences. and Biotech.4: 11-19
5.                    Walia Y, Dhir S, Zaidi AA and Hallan V (2015) Apple scar skin viroid naked RNA is actively transmitted by the whitefly Trialeurodes vaporariorum. RNA Biology 12: 1-8
6.                    Awasthi P, Ram R, Reddy SGE, Nadda G, Zaidi AA and Hallan V (2015) Himalayan wild cherry (Prunus cerasoides) as a new natural host of Cherry necrotic rusty mottle virus (CNRMV) and a possible role of insect vectors in their transmission. Annals of App. Biol. 166: 402-409
7.                    Bhardwaj P, Ram R, Zaidi AA and Hallan V (2015) Natural occurrence of Apple stem grooving virus on Bauhinia variegata. Trees 29:1415-1422
8.                    Dhir S, Walia Y, Zaidi AA and Hallan V (2015) A simplified strategy for studying the etiology of viral diseases: Apple stem grooving virus as a case study. J. Virol. Meth 213: 106-110.
9.                    Awasthi P, Dhyani D, Ram R, Zaidi AA and Hallan V (2015) Wild roses as natural reservoirs of Cherry necrotic rusty mottle virus. European J Plant Pathology 142: 403-409
10.                    Awasthi P, Sood A, Hallan V (2015) Molecular evidence for bamboo as a new natural host of Cherry necrotic rusty mottle virus. Forest Pathology 45, 42-50.
11.                    Bhardwaj P, Ram R, Zaidi AA and Hallan V (2015) Apple stem grooving virus naturally infects Himalayan wild cherry (Prunus cerasoides D. Don). Forest Pathology DOI: 10.1111/efp.12226
12.                    Sharma D, Sharma S, Singh N and Hallan V (2015) Valeriana jatamansi as a new natural host of Bhendi yellow vein mosaic virus and Papaya leaf curl virus betasatellite from Northern India. New Disease Reports 32: 4.
13.                    Walia Y, Dhir S, Ram R, Zaidi AA and Hallan V (2014) Identification of the herbaceous host range of Apple scar skin viroid and analysis of its progeny variants. Plant Pathology 63, 684-690
14.                    Bhardwaj P, Ram R, Zaidi AA and Hallan V (2014) Characterization of Apple stem grooving virus infecting Actinidia deliciosa (Kiwi) in India. Sci Hort.176:  105-111
15.                    Kumar S, Singh L., Ram R, Zaidi AA and Hallan V (2014) Simultaneous Detection of Major Pome Fruit Viruses and a Viroid. Indian J. Microbiology 54:203-210
16.                    Khan MS, Awasthi P, Sharma MP, Ram R, Zaidi AA and Hallan V (2013) Simultaneous detection and identification of four cherry viruses by two step multiplex RT-PCR with an internal control of plant nad5 mRNA. J. Virol. Methods 193 :103- 107
17.                    Noorani MS, Awasthi P, Sukapaka M, Singh L, Raja Ram, Sharma MP, Zaidi AA, Hallan V (2013) Immunodiagnostics for Cherry virus A and Cherry necrotic rusty mottle virus. Journal of Plant Biochemistry and Biotechnology DOI:10.1007/s13562-013-0240-8
18.                    Srivastava A, Raj SK, Kumar S,  Snehi SK, Kulshreshtha A, Hallan V and Pande SS (2013) Molecular identification of Ageratum enation virus, betasatellite and alphasatellite molecules isolated from yellow vein diseased Amaranthuscruentus in India. Virus Genes 47:584-590
19.                    Dhir S, Zaidi AA and Hallan V (2013) Molecular Characterization and Recombination Analysis of the Complete Genome of Apple Chlorotic Leaf Spot Virus. J. Phytopath. 161: 704-12
20.                    Singh L, Hallan V and Zaidi AA (2012) Genomic sequence analysis of four new Chrysanthemum virus B isolates: evidence of RNA recombination. Archives of Virology 157:531-537
21.                    Walia Y, Dhir S, Bhadoria S, Hallan V, Zaidi AA (2012) Molecular characterization of Apple scar skin viroid from Himalayan wild cherry. Journal of forest pathology 42: 84-87
22.                    Kumar S, Singh RM, Raja Ram, Badyal J, Hallan V, Zaidi AA and Varma A (2012) Determination of Major Viral and Sub Viral Pathogens Incidence in Apple Orchards in Himachal Pradesh. Indian J. Virology 23: 75-79
23.                    Kumar Y, Hallan V and Zaidi AA (2011) Chilli leaf curl Palampur virus is a distinct begomovirus species associated with a betasatellite. Plant Pathology 60, 1040-1047
24.                    Rana T, Chandel V, Kumar Y, Raja Ram, Hallan V and Zaidi AA (2010) Molecular variability analyses of Apple chlorotic leaf spot virus capsid protein. Journal of Biosciences 35: 605-615.
25.                    Rana T, Chandel V, Hallan V and Zaidi AA (2011) Expression of recombinant Apple chlorotic leaf spot virus coat protein in heterologous system: production and use in immunodiagnosis. Journal of Plant Biochemistry and Biotechnology 20: 138-141. 
26.                    Singh L, Hallan V, Raja Ram and Zaidi AA (2011) Expression of recombinant Chrysanthemum virus B coat protein for raising polyclonal antisera. Plant Biochemistry and Biotechnology 20: 96-101.
27.                    Zaim M, Kumar Y, Hallan V, Zaidi AA (2011) Velvet bean severe mosaic virus: a distinct begomovirus species causing severe mosaic in Mucuna pruriens (L.) DC. Virus Genes 43, 138-146
28.                    Kumar Y, Hallan V and Zaidi AA (2011) First report of Ageratum enation virus infecting Crassocephalumcrepidioides (Benth.) S. Moore and Ageratum conyzoides L. in India. Journal of General Plant Pathology 77, 214-216
29.                    Dhir S, Hallan V, Raja Ram, Zaidi AA (2011) Molecular characterization of Apple stem pitting virus Indian isolate: Evidence of recombinant isolate. Journal of Plant Pathology 93(2), 471-478
30.                    Lakshmi V, Hallan V, Raja Ram, Ram R, Zaidi AA and Varma A (2011). Diversity of Apple mosaic virus Isolates in India Based on Coat Protein and Movement Protein Genes. Indian J. Virol. 22: 44-49.
31.                    Singh L, Hallan V and Zaidi AA (2011) Intermolecular Interactions of Chrysanthemum virus B Coat Protein: Implications for Capsid Assembly. Indian J. Virology 22(2): 111-116
32.                    Rana T, Chandel V, Kumar Y, Raja Ram, Hallan V and Zaidi AA (2010) Analysis of molecular variability of the capsid protein of Apple chlorotic leaf spot virus. PETRIA-Giornale di PathologiadellePiante20(2): 309-310.
33.                    Noorani MS, Awasthi P, Singh RM, Raja Ram, Sharma MP, Singh SR, Ahmed N, Hallan V and Zaidi AA (2010) Complete nucleotide sequence of Cherry virus A (CVA) infecting sweet cherry in India. Archives of Virology 155(12): 2079-2082.
34.                    Negi A, Rana T, Kumar Y, Raja Ram, Hallan V and Zaidi AA (2010) Analysis of the coat protein gene of Indian strain of Apple stem grooving virus. Journal of Plant Biochemistry and Biotechnology 19(1): 91-94.
35.                    Kumar Y, Bhardwaj P, Hallan V and Zaidi AA (2010) Detection and characterization of Ageratum enation virus and a nanovirus-like satellite DNA1 from zinnia causing leaf curl symptoms in India. Journal of General Plant Pathology 76: 395-398.
36.                    Ayman OF, Kumar Y, Hallan V and Zaidi AA (2010) Molecular characterization of the phytoplasmas associated with toon trees and periwinkle in India. Journal of General Plant Pathology 76: 351-354.
37.                    Chandel V, Manoj K. Singh, Hallan V and Zaidi A.A.(2010) Evidence for the occurrence of a distinct potyvirus on naturally growing Narcissus tazetta Archives of Phytopathology and plant protection43: 209 - 214
38.                    Mahinghara BK, Singh AK, Hallan V, Raja Ram and Zaidi AA (2010) Analysis of coat protein gene & untranslated region of Cucumber mosaic virus isolate infecting various Liliumspecies and hybrids : association of the isolate infecting Asiatic hybrid lily with subgroup II. Archives of Phytopathology and Plant Protection 43: 826-848.
39.                    Walia Y,  Kumar Y, Rana T, Ram R, Hallan V, and Zaidi  A.A.(2010) Variability assessment and construction of infectious clone of Indian Apple Scar Skin Viroid Julius?Kühn?Archiv, 96-100 
40.                    Walia Y, Kumar Y, Rana T, Raja Ram, Hallan V and Zaidi AA (2010) Variability assessment and construction of infectious clone of Indian Apple scar skin viroid. Julius KühnArchiv427: 96-100.
41.                    Hossain M M, Khan S N,  Sharma M, Pathak P, Hallan V and Zaidi A. A.(2010) Cymbidium Moasic Potexvirus and Odontoglossum Ringspot Tobamovirus: Major Threat to Orchid Industry The Journal of Orchid Society of India, 23, 1 & 2 
42.                    Zaidi AA, Hallan V, Rana T, Raikhy G and Ram R (2010) Viruses in ornamental crops and their management: an Indian scenario. Journal of Ornamental Horticulture, 12(3), 147-166.
43.                    Kumar Y, Hallan V and Zaidi AA (2010) Emerging begomovirus problems in India. In: Emerging Geminiviral Diseases and their Management, Eds. P Sharma, RK Gaur and M Ikegami, Nova Science Publishers, Inc, pp 105-128.
44.                    Kumar Y, Hallan V and Zaidi A.A.(2009) First finding of Freesia mosaic virus infecting freesia in India Plant Pathology 58:2
45.                    Kumar Y, Hallan V and Zaidi AA (2009) First finding of Freesia mosaic virus infecting freesia in India. Plant Pathology 58: 404
46.                    Rana T, Chandel V, Hallan V, Zaidi AA. 2009. Molecular evidence for the presence of Apple chlorotic leaf spot virus in infected peach trees in India. Scientia Horticulturae 120 (2) :296-299.
47.                    Kumar Y, Hallan V and Zaidi A.A.(2009) Identification and Characterization of Bean yellow mosaic virus Infecting Freesia J. Plant Biochemistry & Biotechnology 18, 253-255 
48.                    Kumar Y, Hallan V and Zaidi A.A. (2009) Identification and characterization of bean yellow mosaic virus infecting freesia. Journal of Plant Biochemistry & Biotechnology 18: 253-255
49.                    Chandel V, Rana T, Hallan V, Zaidi A.A.(2009) In vitro expression of Prunus necrotic leaf spot virus coat protein gene in heterologous system Indian Journal of Microbiology 49: 128-133  
50.                    Walia Y, Kumar Y, Tanuja Rana, P.D Thakur, Usha Sharma, Raja Ram, Vipin Hallan and Zaidi A.A. (2009). Molecular characterization and variability analysis of Apple scar skin viroid in India. Journal of General Plant Pathology 75:307-311 
51.                    Negi A, Rana T, Kumar Y, Hallan V and Zaidi A.A. (2009) Molecular characterization of Apple stem grooving virus from Pome and Stone fruits in India. Journal of Plant Pathology 91: 501.
52.                    Negi A., Rana t., Kumar Y., Hallan V., Zaidi A. A.(2009) First report of Apple stem grooving virus from pome and stone fruits in India Journal of Plant Pathology91(2):501 
53.                    Negi A, Rana T., Kumar Y., V. Hallan and Zaidi A.A. (2009) Molecular characterization of Apple stem grooving virus from Pome and Stone fruits in India. Journal of Plant Pathology 91:501 
54.                    Thockchom T, Rana T, Hallan V., R. Ram and Zaidi A.A.(2009) Molecular characterization of Indian strain of Apple mosaic virus isolated from apple (Malus domestica) Phytoparasitica37:375-379
55.                    Singh MK, Chandel, V., Hallan, V., Verma, R.R. and Zaidi, A.A. 2009. Occurrence of Peanut stripe virus on Patchouli and Raising of Virus Free Patchouli Plants by Meristem Tip Culture. Journal of Phytopathology and Plant protection 116(1):2-6
56.                    Verma N, K. Kumar, S. Kulshrestha, G. Raikhy, Hallan V., R.Ram, Zaidi A.A.  and I.D. Garg (2009) Molecular studies on Tomato aspermy virus isolates infecting chrysanthemums Archives of Phytopathology and Plant Protection 42: 99 - 111
57.                    Kulshrestha S, Hallan V., G. Raikhy and Zaidi A. A.(2009) Potential Uses of in vitro Expressed and Purified Recombinant Prunus necrotic ringspot virus Coat Protein Gene Archives of Phytopathology and Plant Protection42: 442 - 452
58.                    Mehra A ,Jabeen N. A.K.Singh Hallan V and Zaidi A.A.(2009) A new chrysanthemum potyvirus: a molecular evidence Archives of Phytopathology and Plant Protection.42: 436 - 441
59.                    Ferretti L., Hallan V.,  Ferretti L., Hallan V. , Rana T., Ram R. , Dhir S. , Negi A. , Lakshmi V., Thockchom T. , Zaidi A.A., Barba M (2009) Nucleotide analysis of pome fruit virus isolates detected in apple and pear samples from Italy and India. Julius?Kühn?Archiv 230-236
60.                    Zaidi AA, Hallan V, Rana T, Raikhy G and Raja Ram (2009) Viruses in ornamental crops and their management: an Indian scenario. Journal of Ornamental Horticulture 12(3): 147-166.
61.                    MK Singh, V Chandel, V Hallan, R Ram, AA Zaidi. Occurrence of Peanut stripe virus on patchouli and raising of virus-free patchouli plants by meristem tip culture, Journal of Plant Diseases and Protection 116 (1), 2-6
62.                    Chandel V, Rana T, Kumar Y, Hallan V, Zaidi A.A.(2009) Stone fruit viruses:Economic importance and biotechnological approaches towards management strategies Current Topics in virology vol-1 Plant viral Diseases 
63.                    Hossain MM, Khan SN, Sharma M, Pathak P, Hallan V and Zaidi AA (2009) Cymbidium mosaic potexvirusand Odontoglossum ringspot tobamovirus: Major threat to orchid industry. Journal of the Orchid Society of India 23 (1&2): 20-24.
64.                    Sharma S, Singh B, Rani G, Zaidi A.A, Hallan V, Nagpal AK and Virk GS(2008) In vitro production of Indian citrus ringspot virus (ICRSV) free Kinnow plants employing thermotherapy coupled with shoot tip grafting Plant Cell Tissue And Organ Culture 92 (1): 85-92
65.                    Rana T., V. Chandel, Hallan V & Zaidi A.A.(2008) Cydonia oblonga as reservoir of Apple chlorotic leaf of spot virus in India Plant Pathology 57:393
66.                    Singh B, Sharma S, Rani G, Hallan V, Zaidi AA, Virk GS and Nagpal A (2008) In vitro micrografting for production of Indian citrus ringspot virus (ICRSV)-free plants of kinnow mandarin (Citrus nobilisLour X C. deliciosaTenora). Plant Biotechnology Reports 2(2): 137-143
67.                    Rana T., Chandel V., Hallan V. and Zaidi A.A.(2008) Himalayan wild cherry (Prunus cerasoides D. Don) as new host of Apple chlorotic leaf spot virus Forest Pathology 38 (2): 73-77
68.                    Kumar Y, Hallan V and Zaidi AA (2008) Molecular characterization of a distinct bipartite begomovirus species infecting tomato in India. Virus Genes 37: 425-431
69.                    Kumar Y , Hallan V, Zaidi A. A.(2008) Molecular characterization of a distinct bipartite begomovirus species infecting tomato in India Virus Genes37: 425-431
70.                    Singh AK, Mahinghara BK, Hallan V, Ram R and Zaidi AA (2008) Recombination and phylogeographical analysis of lily symptomless virus. Virus Genes 36: 421-427.
71.                  Rana T., V. Chandel, Hallan V. and Zaidi A.A. (2008) Molecular evidence for Apple chlorotic leaf spot virus in wild and cultivated apricot in Himachal Pradesh, India. Jour. of Plant Pathology  89: 572
72.                  Chandel V, Rana T, Handa A, Thakur PD, Hallan V and ZaidiAA (2008) Incidence of Prunus necrotic ring spot virus on Malusdomestica in India. Journal of Phyotopathology, 156:382-384
73.                  Verma N, Kumar K, Kulshrestha S, Raikhy G, Hallan V, Ram R, ZaidiAAand Garg ID (2008) Molecular studies on Tomataaspermy virus isolates infecting chrysanthemums. Archives of Phytopathology and Plant Protection 42(2): 99-111
74.                  Rana T, Chandel V, Hallan V and Zaidi AA (2008) Characterisation of apple chlorotic leaf spot virus infecting almonds in India. Australasian Plant Disease 3(1): 65-67
75.                  ChandelV, Rana T,Hallan V and Zaidi AA.(2008) Occurrence of Prunus necrotic ringspot virus on nectarine (Prunus persica) in India. European plant protection organization (EPPO), 38: 223-225
76.                  Chandel V, Rana T, Hallan V and Zaidi A.A. Wild Himalayan cherry (Prunus cerasoides) as a natural host of Prunus necrotic ringspot virus in India (2007) Plant Disease 91 (12): 1686
77.                  Sherpa AR, Bag TK, Hallan V and Zaidi A.A.(2007) Incidence of Cymbidium mosaic virus in Sikkim. Indian Phytopathology 60: 133-136
78.                  Singh L, Hallan V, Jabeen N, Singh A K, Ram R, Martin DP and Zaidi AA (2007) Coat protein gene diversity among Chrysanthemum virus B isolates from India. Archives of Virology 152(2): 405-413
79.                  Verma N, Mehra A, Singh L, Hallan V, Singh AK, Jabeen N, Singh MK, Ram R and Zaidi AA (2007) Screening of viruses infecting chrysanthemum cultivars in India.ScientiaHorticulturae 111(3): 260-265
80.                  Sherpa AR, Hallan V, Pathak P and Zaidi A.A.(2007) Complete nucleotide sequence analysis of Cymbidium mosaic virus Indian isolate: further evidence for natural recombination among potex viruses. Journal of Biosciences 34(4): 663-669
81.                  Chandel V, Rana T, Hallan V and Zaidi A.A.(2007) Evidence for the occurrence of Prunus necrotic ringspot virus on peach in India by serological and molecular methods Canadian Journal of plant pathology 29: 311-316
82.                  Sharma S, Singh B, Rani G,. Zaidi A. A, Hallan V, Nagpal A and Virk G. S.(2007) In vitro production of Indian citrus ringspot virus (ICRSV) free kinnow plants employing phytotherapy coupled with shoot tip grafting In Vitro Cellular & Developmental Biology-Plant 43 (3): 254-259
83.                  Singh MK, Sherpa AR, Hallan V and Zaidi AA (2007) A potyvirus in Cymbidium spp.in northern India. Autralasian Plant pathology 2: 11-13
84.                  Raikhy G, Hallan V, Kulshrestha S and Zaidi A.A.(2007) Polyclonal antibodies to the coat protein of Carnation etched ring virus expressed in bacterial system: Production and use in immunodiagnosis Journal of Phytopathology 155 (10): 616-622
85.                  Sharma S, Singh B, Rani G, Zaidi A.A, Hallan V, Nagpal A and Virk GS (2007) Production of Indian citrus ringspot virus free plants of kinnow employing chemotherapy coupled with shoot tip grafting Journal of Central European Agriculture8(1): 1-8
86.                  Rana T, Chandel V, Hallan V and Zaidi A.A.(2007) Molecular evidence of Apple chlorotic leaf spot virus in Himachal Pradesh Indian Journal of virology 18(2):70-74
87.                  Adekunle, O.K., Kulshrestha, S., Prasad, R. , Hallan, V., Raikhy, G., Verma, N., Ram, R., Kumar, S., Zaidi, A. A.(2006) Plant parasitic and vector nematodes associated with asiatic and oriental hybrid lilies. Bioresource Technology 97: 364-371
88.                  Chandel, V., Kulshrestha, S., Hallan, V. and Zaidi, A. A.(2006) Natural infection of Ornithogalum mosaic virus on Iris from India Plant Pathology55(2): 284
89.                  Singh B, Sharma S, Rani G, Zaidi AA, Hallan V and Nagpal, A (2006) In vitro production of Indian Citrus Ringspot virus free plants of Kinnow mandarin Citrus nobilisLour.C. deliciosaTenora by Nucellar embryo cultures. Plant Pathology Journal 5: 274-282
90.                  Mehra, A., Hallan, V., Lal, B. and Zaidi, A. A.(2006) Occurence of Chilli vein mottle virus in Himalayan Butterfly bush (Buddelja crispa) Plant Pathology55(2): 284
91.                  Sherpa, A. R., Bag, T. K., Hallan, V. and Zaidi, A. A.(2006) Detection and incidence of odontoglossum ringspot virus in orchids Australasian Plant pathology35: 69-71
92.                  Raikhy, G., Hallan, V., Kulshrestha, S., Ram, R. and Zaidi, A. A. (2006) Complete nucleotide sequence of an Indian isolate of carnation etched ring virus and its homology with other caulimoviruses. Current science  90: 176-187
93.                  Raikhy, G., Hallan, V., Kulshrestha, S., Ram, R. and Zaidi, A. A.(2006) Multiplex PCR and genome analysis of carnation mottle virus Indian isolate. Current Science 90: 74-82
94.                  Sherpa AR, Hallan V, Pathak P and Zaidi AA (2006) Coat protein gene of Cymbidium mosaic virus: Characterization of geographical isolates from India. Journal of Phytopathology 154:275-280
95.                  Singh B, Sharma S, Rani G, Zaidi AA, Hallan V, Nagpal A and Virk GS (2006) In vitro production of Indian citrus ringspot virus free plants of Kinnow Mandarin (Citrus nobilis x C. deliciosaTeriora) by ovule culture. J. Plant Biotechnology 7(4): 254-265
96.                  Kulshrestha, S., Hallan, V., Raikhy, G., Ram, R., Garg, I. D., Haq, Q. M. R. and Zaidi, A. A. (2006) Occurrence of iris mild mosaic potyvirus in cultivated iris in India. Indian Journal of Biotechnology 5: 94-98
97.                  Verma N, Hallan V, Ram R, Kumar K, Garg ID and Zaidi AA (2006) Detection and molecular characterization of a Tomato aspermy virus isolate infecting chrysanthemums in India.  Acta Horticulture 722, 41-53
98.                  Kulshrestha S, Hallan V, Raikhy G, Ram R, Garg ID and Zaidi AA (2006) Incidence of Bean yellow mosaic virus on Iris. Acta Horticulture 722, 235-240
99.                  Raikhy G, Hallan V, Kulshrestha S, Ram R and Zaidi AA (2006) Detection of Carnation ringspot and Carnation vein mottle virus (es) in Carnation cultivars in India. Acta Horticulture 722, 247-258
100.                  Chandel , V., Hallan, V. and Zaidi, A. A.(2005) Natural Occurrence of a Potyvirus on Murraya koenigii in India Plant Disease89, 909
101.                  Singh, A. K., Hallan V., Verma, N. and Zaidi, A. A.(2005) Natural occurrence of Lily symptomless virus on spider lily Plant Pathology 54: 255
102.                  Verma, N., Singh, L., Singh, A. K., Kulshreshtha, S., Raikhy, G., Hallan, V., Ram, R. and Zaidi, A. A.(2005) Ornithogalum: a new host of Cucumber mosaic virus (CMV) from India Plant Pathology 54: 256
103.                  Singh, A. K., Hallan, V., Ram, R. and Zaidi, A.A(2005) Variability in the coat protein of Lily symptomless virus isolates infecting various Plant Pathology54: 621-624
104.                  Mehra, A., Hallan, V., Lal, B., Negi, H. R. and Zaidi, A. A.(2005) Sorbaria tomentosa (Lind.) Rehd. - hitherto unknown natural host of Potato virus Y (PVY) Plant Pathology54, 572
105.                  Ram, R., Verma, N., Singh, A. K., Singh, L., Hallan, V. and Zaidi, A. A. (2005) Indexing and production of virus-free chrysanthemums Biologia Plantarum49: 149-152
106.                  Sharma, A., Mahinghara, B. K., Singh, A. K., Kulshrestha, S., Raikhy, G., Singh, L., Verma, N., Hallan, V., Ram, R. and Zaidi, A. A.(2005) Identification, Detection and Frequency of Lily Viruses in Northern India. Scientia Horticulturae106: 213-227
107.                  Verma, N., Singh, A. K., Singh, L., Raikhy, G., Kulshrestha, S., Singh, M. K., Hallan, V., Ram, R. and Zaidi, A. A.(2005) Cucumber mosaic virus (CMV) infecting Alstroemeria hybrids in India Australasian Plant Pathology 34: 119-120
108.                  Kulshrestha, S., Verma, N., Hallan, V., Raikhy, G., Singh, M. K., Ram, R. and Zaidi, A.(2005) Detection and identification of prunus necrotic ringspot virus in pelargonium. Australasian PlantPathology 34:599-601
109.                  Singh, H. P., Hallan, V., Raikhy, G., Kulshrestha, Sharma, M.L., Ram, R., Garg, I. D. and Zaidi, A. A.(2005) Characterization of an Indian isolate of Carnation mottle virus (CarMV) infecting carnations. Current Science, 88: 594-601 
110.                  Kulshrestha, S., Mehra, A., Hallan, V., Raikhy, G., Ram, R. and Zaidi, A. A.(2005) Molecular evidence for occurrence of Tuberose mild mottle virus infecting tuberose (Polianthes tuberosa) in India Current Science89(5): 870-872
111.                  Kulshrestha, S., Hallan, V., Raikhy, G., Adekunle, O.K., Haq, Q. M. R., Verma, N. and Zaidi A. A.(2005) Reverse transcription polymerase chain reaction (RT-PCR) detection of Arabis mosaic and Strawberry latent ringspot virus in Nematodes. Current Science 89: 1759-1762
112.                  Verma, N., Singh, A. K., Singh, L., Kulshrestha, S., Raikhy, G., Hallan, V., Ram, R. and Zaidi(2004) Occurrence of Cucumber mosaic virus in Gerbera jamesonii from India. Plant Disease88: 1161
113.                  Kulshrestha, S., Hallan, V., Raikhy, G., Ram, R. and Zaidi, A. A.(2004) Strawberry latent ringspot virus infecting roses in India Plant Disease 88: 86
114.                  Verma, N., Ram, R., Hallan, V., Kumar, K. and Zaidi, A. A. (2004) Production of cucumber mosaic virus - free chrysanthemums by meristem tip culture. Crop Protection 23: 469-473
115.                  Sherpa, A. R., Hallan, V., Zaidi, A. A.(2004) Cloning and sequencing of coat protein gene of an Indian Odontoglossum ringspot virus isolate. Acta Virologica 48: 267-269
116.                  Kulshrestha, S., Hallan, V., Raikhy, G., Kumar, A., Ram, R., Garg, I. D. and Zaidi, A. A.(2004) Molecular characterization of an Iris severe mosaic virus isolate from India Acta Virologica 48: 65-67
117.                  Sharma S, Singh B, Rani G, Nagpal A, Zaidi A.A., Hallan V and Virk GS (2004) Current status of Indian citrus ringspot virus in kinnow orchards of Punjab and neigbouring states.  Int. J. of Bioscience Reporter. 2(2): 132-135
118.                  Verma, N., Ram, R., Hallan, V. and Zaidi, A. A.(2004) Meristem tip culture to produce Cucumber mosaic virus free chrysanthemums Australian Flower Industry 2: 14
119.                  Ram, R., Joshi, A, Verma, N., Kulshrestha, S., Raikhy, G., Hallan, V. and Zaidi, A. A. (2003) First report of Dasheen mosaic virus infecting four ornamental aroids in India Plant Pathology 52: 411
120.                  Raikhy G., Hallan, V., Kulshrestha, S., Sharma, M. L., Ram, R. and Zaidi, A. A.(2003) First Report Of Carnation Necrotic Fleck Virus (Cnfv) Infecting Carnations In India Plant Pathology, 52: 801 
121.                  Sherpa, A.R., Hallan, V., Ram, R., Vij, S.P., Pathak, P., Garg, I.D. and Zaidi, A.A.(2003) First Report Of Cymbidium Mosaic Virus On Cymbidiums In India Plant Pathology 52: 788
122.                  Verma, N., Ram, R., Sharma, A., Hallan, V., Zaidi, A. A. and Garg, I. D.(2003) Detection, Identification And Incidence Of Chrysanthemum B Carlavirus In Chrysanthemum In India Crop Protection 22: 425-429
123.                  Raikhy, G., Hallan, V., Kulshrestha, S., Sharma, M. L., Ram, R. and Zaidi, A. A.(2003) Molecular characterization of a Carnation etched ring virus isolate from India ACTA VIROLOGICA 47: 105-111
124.                  Zhu et al., 2003 Identification of Arabidopsis rat (resistant to agrobacterium tumefaciens) mutants. Plant physiology 132 (2), 494-505

4.                  Verma, N., Hallan, V., Ram, R. and Zaidi, A. A. (2002) Detection of Prunus necrotic ringspot virus in begonia by RT-PCR. Plant Pathology 51: 800
5.                  Hallan V and Gafni, Y (2001) Tomato yellow leaf curl virus capsid protein (CP) subunit interactions: implications for viral assembly. Archives of Virology 146(9):1765-73
6.                  Saxena S, Hallan V, Singh BP, Sane PV (1998). Leaf curl disease of Carica papaya from India may be caused by a bipartite geminivirus. Plant Disease 82 (1), 126-126
7.                  Saxena S, Hallan V, Singh BP, Sane PV (1998). Nucleotide sequence and intergeminiviral homologies of the DNA‐A of papaya leaf curl geminivirus from India. IUBMB Life 45 (1), 101-113
8.                  Raj SK, Saxena S, Hallan V, Singh BP. Reverse transcription‐polymerase chain reaction (RT‐PCR) for direct detection of cucumber mosaic virus (CMV) in gladiolus. IUBMB Life 44 (1), 89-95
9.                  Hallan V, Saxena S, Singh BP. (1998) Ageratum, Croton and Malvastrum harbour geminiviruses: evidence through PCR amplification. World Journal of Microbiology and Biotechnology 14 (6), 931-932
10.                  Srivastava KM, Hallan V, Raizada RK, Chandra G, Singh BP, Sane PV (1995). Molecular cloning of Indian tomato leaf curl virus genome following a simple method of concentrating the supercoiled replicative form of viral DNA, Journal of Virological Methods 51 (2-3), 297-304

List of PhD degree completed

As supervisor

1.      Dr. Lakhmir Singh (2006) Molecular Characterization and intermolecular interactions of the coat protein of Chrysanthemum virus B carlavirus infecting Chrysanthemum; GNDU, Amritsar/CSIR-IHBT; Botany

Working as Associate Prof. DAV University Jalandhar

2.      Dr. Yogesh Kumar (2011) Genome Organization and Mechanism of RNA Silencing Suppression of Begomoviruses Infecting Some Solanaceous Crops; GNDU Amritsar; Biotechnology

Working as Prof. Central university of Jammu

3.      Dr. Salik Noorani Khan (2012) Molecular Characterization and Diagnostic Development of Viruses Infecting Sweet Cherry (Prunus avium L.) in Western Himalaya; Jamia Hamdard New Delhi; Botany

Working as Asstt. Prof. Jamia Hamdard

4.      Dr. Yashika Walia (2015) Apple scar skin viroid: Infectivity and identification of interacting protein, Academy of Scientific and Innovative Research (AcSIR); Biological sciences 

Working as Asstt. Prof. Maharish Markandeshawar University, Mullana, Ambala

5.      Dr. Sunny Dhir (2016) Complete Genome Characterization and Infectivity Analyses of Apple stem pitting and Apple stem grooving viruses Infecting Apple; AcSIR; Biological sciences

Working as Asstt. Prof. Maharish Markandeshawar University, Mullana, Ambala

6.      Dr. Prachi Awasthi (2016) Molecular characterization and development of diagnostics for Cherry necrotic rusty mottle virus; AcSIR; Biological sciences

7.      Dr. Pooja Bhardwaj (2016) Molecular Characterization and Development of Diagnostics for Apple stem grooving virus; AcSIR; Biological sciences

8.      Dr. Reenu Kumari (2016) Understanding Molecular Basis of Cucumber Mosaic Virus Movement in Plants; GNDU; 

Working as Asstt, Prof. Dr YS Parmar Universuty of Hort and Forestry, HP

9.      Dr. Rahul Mohan Singh (2017) Expression analysis and identification of host factor(s) associating with movement protein of Apple chlorotic leaf spot virus; AcSIR; Biological sciences 

Project scientist-II at CSIR-IHBT

1.   Dr. Poonam Roshan (2017) Functional Characterization of AV2 protein of tomato leaf curl Palampur virus; AcSIR; Biological sciences

Postdoctoral researcher, St Louis, Missouri, United States

1.   Dr. Aditya Kulshreshtha (2017) Functional Characterization of AC4 protein of tomato leaf curl Palampur virus; AcSIR; Biological sciences

Postdoctoral Researcher, Texas A&M AgriLife Research and Extension Center, USA

2.   Dr. Surender Kumar (2017) Virome Study of Pigeonpea Sterility Mosaic Disease in Pigeonpea (Cajanus cajan) by Small RNA Sequencing and Sequence Independent Amplification Approaches; AcSIR; Biological sciences

Project scientist-II at CSIR-IHBT

3.   Dr Bharti Lalhal Barsain (2021) Assessment of Geranyl Pyrophosphate Synthase/Geranyl Geranyl Pyrophosphate Synthase (GPPS/GGPPS) Enzyme System and Epigenetic Regulation Upon Picroside Biosynthesis Pathway
4.   Dr Poonam Bharti (2023) Studies on epigenetic regulation of flavonoid and antioxidative pathways in Nicotiana tabacum during salt stress 
5.   Dr Usha Rattan (2023) Elucidating the Role of Homeobox 27 during Disease Development by Cucumber mosaic virus

   As co-supervisor

6.   Dr Rashmi Kalia (2017) Molecular identification and characterization of important viruses infecting chrysanthemum; under joint supervision with Dr Avinash Nagpal, Botanical sciences, GNDU, Amritsar
7.   Dr Poonam Chaudhary (2022) Indexing of Viruses infecting Tomato crop in Punjab and Himachal Pradesh, under joint supervision with Dr Avinash Nagpal, Botanical sciences, GNDU, Amritsar

Current Lab Members

1.      Bipasha Bhattacharjee (INSPIRE PhD/ Fulbright Fellow); Functional Characterisation of At/Cs Nuclear Factor-YB8 (NF-YB8) transcription factors in viral disease progression

2.      Kamini Kapoor (PhD, DBT-SRF); Understanding the role of Glycine Rich Protein in Cuucmber Mosaic virus pathogenesis

3.      Anish Tamang (PhD, ICMR-SRF) ; “Studies on modulation of Picrosides content Tomato leaf curl Palampur virus and endophytes in Picrorhiza kurrooa

4.      Savita Chaudhary (PhD) ; The role of host proteins binding to genomic RNAs of virus and virus like pathogens

5.      Abhisha Roy (Industry-sponsored PhD) ; Identification and Characterization of Defense Signaling Pathways primed by Seaweed Extracts

6.      Govind Rai (PhD, CSIR-JRF) ; Identification and Characterisation of endosymbionts from Trialeurodes vaporariorum and their potential role in transmission of ASSVd

7.      Parmeet Kaur (PhD, CSIR-JRF) ; Role of viral and host factors in circulative transmission of Tomato begomovirus by the whitefly Bemisia tabaci

8.      Naorem Priyaluxmi Devi (Project Associate II) ; Surveillance, multiplex virus diagnostics, raising quality rootstocks for promotion of low chilling varieties of apple (Malus domestica Borkh.) in Manipur to improve the livelihood of local farmers

9.      Monika Choudhary (Project Scientist 2) ; Development of mycovirus based biological control strategy for the control of Rosellinia necartix infecting fruit crops and Sclerotinia sclerotiorum infecting vegetable crops in the Indian Himalayan Region