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                    U.S. DEPARTMENT OF AGRICULTURE
 Crops Pathology and Genetics Research: Davis, CA
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Mysore R Sudarshana    Research Plant Pathologist **Phone:**
(530) 752-3621**Fax:**
(530) 754-7195**Office:**
University of California, Davis
380 Hutchison Hall
Davis, CA 95616
 /ARSUserFiles/42584/sudhi.png
 Publications(Clicking on the reprint iconReprint Icon  will take you to the publication reprint.)Grapevine red blotch virus alters grape skin cell-wall composition impacting phenolic extractability during winemaking-(Peer Reviewed Journal) Rumbaugh, A.C., Medina-Plaza, C., Sudarshana, M.R., Oberholster, A. 2023. Grapevine red blotch virus alters grape skin cell-wall composition impacting phenolic extractability during winemaking. Journal of the Science of Food and Agriculture. 103(7):3457-3467. https://doi.org/10.1002/jsfa.12481.Investigating grapevine red blotch virus infection in Vitis vinifera L. cv. Cabernet Sauvignon grapes: A multi-omics approach-(Peer Reviewed Journal) Rumbaugh, A.C., Durbin-Johnson, B., Padhi, E., Lerno, L., Cauduro Girardello, R., Britton, M., Slupsky, C., Sudarshana, M.R., Oberholster, A. 2022. Investigating grapevine red blotch virus infection in Vitis vinifera L. cv. Cabernet Sauvignon grapes: A multi-omics approach. International Journal of Molecular Sciences. 23(21). Article 13248. https://doi.org/10.3390/ijms232113248.Grapevine red blotch disease etiology and its impact on grapevine physiology and berry and wine composition-(Review Article) Rumbaugh, A.C., Sudarshana, M.R., Oberholster, A. 2021. Grapevine red blotch disease etiology and its impact on grapevine physiology and berry and wine composition. Horticulturae. 7(12). Article 552. https://doi.org/10.3390/horticulturae7120552.First report of grapevine leafroll-associated virus 3 in Vitis vinifera in North Carolina-(Peer Reviewed Journal) Hoffmann, M., Talton, W., Nita, M., Jones, T., Al Rwahnih, M., Sudarshana, M.R., Almeyda, C. 2020. First report of grapevine leafroll-associated virus 3 in Vitis vinifera in North Carolina. Journal of Plant Pathology. 103:385-386. https://doi.org/10.1007/S42161-020-00710-3.Impact of grapevine Red Blotch Disease on primary and secondary metabolites in ‘Cabernet Sauvignon’ grape tissues-(Peer Reviewed Journal) Pereira, G.E., Padhi, E.M., Sudarshana, M.R., Fialho, F.B., Plaza, C.M., Girardello, R.C., Tseng, D., Bruce, R.C., Erdmann, J.N., Slupsky, C.M., Oberholster, A. 2020. Impact of grapevine Red Blotch Disease on primary and secondary metabolites in ‘Cabernet Sauvignon’ grape tissues. Journal of Food Chemistry. 342. Article 128312. https://doi.org/10.1016/j.foodchem.2020.128312.First report of grapevine red blotch virus, the causal agent of grapevine red blotch disease in vitis vinifera in North Carolina-(Peer Reviewed Journal) Hoffmann, M., Talton, W., Nita, M., Taylor, J., Al Rwahnih, M., Sudarshana, M.R., Almeyda, C. 2020. First report of grapevine red blotch virus, the causal agent of grapevine red blotch disease in vitis vinifera in North Carolina. Plant Disease. 104(4):1266-1266. https://doi.org/10.1094/PDIS-07-19-1539-PDN.A Grapevine red blotch virus vector: the three-cornered alfalfa hopper (3CAH), Spissistilus festinus, in Napa vineyards-(Trade Journal) Preto, C.R., Sudarshana, M.R., Zalom, F.G. 2019. A Grapevine red blotch virus vector: the three-cornered alfalfa hopper (3CAH), Spissistilus festinus, in Napa vineyards. American Vineyard Magazine. 28:14-18.Seasonal dynamics of Spissistilus festinus (Hemiptera: Membracidae) in a Californian vineyard-(Peer Reviewed Journal) Preto, C.R., Bahder, B.W., Bick, E.N., Sudarshana, M.R., Zalom, F.G. 2019. Seasonal dynamics of Spissistilus festinus (Hemiptera: Membracidae) in a Californian vineyard. Journal of Economic Entomology. 112(3):1138-1144. https://doi.org/10.1093/jee/toz022.Spatial associations of vines infected with grapevine red blotch virus in Oregon vineyards-(Peer Reviewed Journal) Dalton, D.T., Hilton, R.J., Kaiser, C., Daane, K.M., Sudarshana, M.R., Vo, J., Zalom, F., Buser, J.Z., Walton, V.M. 2019. Spatial associations of vines infected with grapevine red blotch virus in Oregon vineyards. Plant Disease. 103(7):1507-1514. https://doi.org/10.1094/PDIS-08-18-1306-RE.Characterization of grapevine leafroll-associated virus 3 genetic variants and application towards RT-qPCR assay design-(Peer Reviewed Journal) Diaz-Lara, A., Klaassen, V., Stevens, K., Sudarshana, M.R., Rowhani, A., Maree, H.J., Chooi, K.M., Blouin, A.G., Habili, N., Song, Y., Aram, K., Arnold, K., Cooper, M.L., Wunderlich, L., Battany, M.C., Bettiga, L.J., Smith, R.J., Bester, R., Xiao, H., Meng, B., Preece, J.E., Golino, D., Alrwahnih, M. 2018. Characterization of grapevine leafroll-associated virus 3 genetic variants and application towards RT-qPCR assay design. PLoS One. 13(12):e0208862. https://doi.org/10.1371/journal.pone.0208862.Vitis vinifera (Vitales: Vitaceae) as a reproductive host of Spissistilus festinus (Hemiptera: Membracidae)-(Peer Reviewed Journal) Preto, C.R., Sudarshana, M.R., Bollinger, M.L., Zalom, F.G. 2018. Vitis vinifera (Vitales: Vitaceae) as a reproductive host of Spissistilus festinus (Hemiptera: Membracidae). Journal of Insect Science. 18(6):1-7. https://doi.org/10.1093/jisesa/iey129.World management of geminiviruses-(Peer Reviewed Journal) Rojas, M.R., Macedo, M.A., Maliano, M.R., Soto-Aguilar, M., Souza, J.O., Briddon, R.W., Kenyon, L.A., Rivera Bustamante, R.F., Zerbini, M.F., Adkins, S.T., Legg, J.P., Kvarnheden, A., Wintermantel, W.M., Sudarshana, M.R., Peterschmitt, M., Lapidot, M., Martin, D.P., Moriones, E., Inoue-Nagata, A.K., Gilbertson, R.L. 2018. World management of geminiviruses. Annual Review of Phytopathology. 56:637-677. https://doi.org/10.1146/annurev-phyto-080615-100327.Feeding and reproductive hosts of Spissistilus festinus (Say) (Hemiptera: Membracidae) found in Californian vineyards-(Peer Reviewed Journal) Preto, C.R., Sudarshana, M.R., Zalom, F.G. 2018. Feeding and reproductive hosts of Spissistilus festinus (Say) (Hemiptera: Membracidae) found in Californian vineyards. Journal of Economic Entomology. 111(6), 2531-2535. https://doi.org/10.1093/jee/toy236.Investigating the spread and effect of Grapevine red blotch virus in California-grown Zinfandel-(Proceedings) Wunderlich, L.R., Bollinger, M.L., Castillo, M.N., Preto, C.R., Bahder, B.W., Zalom, F.G., Sudarshana, M.R. 2017. Investigating the spread and effect of Grapevine red blotch virus in California-grown Zinfandel. In: Proceedings of XXth Group of International Experts of Vitivinicultural Systems for CoOperation(GiESCO) International Meeting, November 5-10, Mendoza, Argentina.Implicated vectors and spread of grapevine red blotch-associated virus in Oregon vineyards-(Abstract Only) Dalton, D.T., Walton, V.M., Hilton, R.J., Sudarshana, M.R. 2017. Implicated vectors and spread of grapevine red blotch-associated virus in Oregon vineyards. Oregon Wine Research Institute Grape Day, April 6, 2017, Corvallis, Oregon.Red blotch in Oregon-(Abstract Only) Walton, V.M., Dalton, D.T., Hilton, R.J., Sudarshana, M.R. 2017. Red blotch in Oregon. Oregon Wine Research Institute Grape Day, April 6, 2017, Corvallis, Oregon.Effects of grapevine red blotch-associated virus (GRBaV) infection on foliar metabolism of grapevines-(Peer Reviewed Journal) Wallis, C.M., Sudarshana, M.R. 2016. Effects of grapevine red blotch-associated virus (GRBaV) infection on foliar metabolism of grapevines. Canadian Journal of Plant Pathology. 38:358-366.Disease management in the genomics era - Summaries of focus issue papers-(Review Article) Klosterman, S.J., Rollins, J.R., Sudarshana, M.R., Vinatzer, B.A. 2016. Disease management in the genomics era - Summaries of focus issue papers. Phytopathology. 106:1068-1070.An evaluation of the flora adjacent to wine grape vineyards for the presence of alternative host plants of grapevine red blotch-associated virus-(Peer Reviewed Journal) Bahder, B.W., Zalom, F.G., Sudarshana, M.R. 2016. An evaluation of the flora adjacent to wine grape vineyards for the presence of alternative host plants of grapevine red blotch-associated virus. Plant Disease. 100:1571-1574. doi: 10.1094/PDIS-02-16-0153-RE.Phylogeny of geminivirus coat protein sequences and digital PCR aid in identifying Spissistilus festinus (Say) as a vector of Grapevine red blotch-associated virus-(Peer Reviewed Journal) Bahder, B.W., Jayanth, M., Zalom, F.G., Sudarshana, M.R. 2016. Phylogeny of geminivirus coat protein sequences and digital PCR aid in identifying Spissistilus festinus (Say) as a vector of Grapevine red blotch-associated virus. Phytopathology. doi: 10.1094/PHYTO-03-16-0125-FI.Preparation of mealybugs (Hemiptera: Pseudococcidae) for genetic characterization and morphological examination-(Peer Reviewed Journal) Bahder, B.W., Bollinger, M., Sudarshana, M.R., Zalom, F.G. 2015. Preparation of mealybugs (Hemiptera: Pseudococcidae) for genetic characterization and morphological examination. Journal of Insect Science. doi: 10.1093/jisesa/iev086.Detection of a new luteovirus in imported nectarine Trees: A case study to propose adoption of metagenomics in post-entry quarantine-(Peer Reviewed Journal) 2015. Detection of a new luteovirus in imported nectarine Trees: A case study to propose adoption of metagenomics in post-entry quarantine. Phytopathology. 105(6):840-846.Detection of a new luteovirus in imported nectarine trees: A case study to propose adoption of metagenomics in post-entry quarantine-(Peer Reviewed Journal) Bag, S., Al Rwahnih, M., Li, A., Gonzalez, A., Rowhani, A., Uyemoto, J.K., Sudarshana, M.R. 2015. Detection of a new luteovirus in imported nectarine trees: A case study to propose adoption of metagenomics in post-entry quarantine. Phytopathology. 105:840-846.Grapevine red blotch-associated virus, an emerging threat to the grapevine industry-(Peer Reviewed Journal) Sudarshana, M.R., Perry, K.L., Fuchs, M. 2015. Grapevine red blotch-associated virus, an emerging threat to the grapevine industry. Phytopathology. doi: org/10.1094/PHYTO-12-14-0369-FI.Detection and genetic diversity of Grapevine red blotch-associated virus isolates in table grape accessions in the National Clonal Germplasm Repository in California-(Peer Reviewed Journal) Al Rwahnih, M., Rowhani, A., Golino, D., Islas, C., Preece, J.E., Sudarshana, M.R. 2015. Detection and genetic diversity of Grapevine red blotch-associated virus isolates in table grape accessions in the National Clonal Germplasm Repository in California. Canadian Journal of Plant Pathology. 37:130-135.Grapevine red blotch-(Book / Chapter) Sudarshana, M.R., Fuchs, M. 2015. Grapevine red blotch. In: Wilcox, W.F., Gubler, W.D., Uyemoto, J.K., editors. Compendium of Grape Diseases. 2nd edition. St. Paul, MN: American Phytopathological Society Press. p. 122-123.Gene from a novel plant virus satellite from grapevine identifies a viral satellite lineage-(Peer Reviewed Journal) Al Rwahnih, M., Daubert, S.D., Sudarshana, M.R., Rowhani, A. 2013. Gene from a novel plant virus satellite from grapevine identifies a viral satellite lineage. Virus Genes. 47:114-118.Grapevine red blotch-associated virus is widespread in California 
and U.S. vineyards.-(Abstract Only) Sudarshana, M.R., Gonzalez, A., Dave, A., Wei, A., Smith, R., Anderson, M.M., Walker, M.A. 2013. Grapevine red blotch-associated virus is widespread in California  and U.S. vineyards. . Phytopathology. 103:458.Association of a DNA virus with grapevines affected by red blotch disease in northern California-(Peer Reviewed Journal) Al Rwahnih, M., Dave, A., Anderson, M.M., Rowhani, A., Uyemoto, J.K., Sudarshana, M.R. 2013. Association of a DNA virus with grapevines affected by red blotch disease in northern California. Phytopathology. 103:1069-1076.Detection of Grapevine Leafroll-associated virus 7 using real-time qRT-PCR and conventional RT-PCR-(Peer Reviewed Journal) Al Rwahnih, M., Osman, F., Sudarshana, M.R., Uyemoto, J.K., Minafra, A., Martelli, G., Rowhani, A. 2012. Detection of Grapevine Leafroll-associated virus 7 using real-time qRT-PCR and conventional RT-PCR. Journal of Virological Methods. 179:383-9.Grapevine necrotic union, A newly recognized disease of unknown etiology in grapevines grafted on 110 Richter rootstock in California-(Peer Reviewed Journal) Al Rwahnih, M., Rowhani, A., Smith, R.J., Uyemoto, J.K., Sudarshana, M.R. 2012. Grapevine necrotic union, A newly recognized disease of unknown etiology in grapevines grafted on 110 Richter rootstock in California. Journal of Plant Pathology. 94(1), 149-156.Detection of Grapevine leafroll-associated virus 7 using real-time PCR and conventional RT-PCR-(Abstract Only) Al Rwahnih, M., Osman, F., Sudarshana, M.R., Uyemoto, J.K., Rowhani, A. 2011. Detection of Grapevine leafroll-associated virus 7 using real-time PCR and conventional RT-PCR. Phytopathology. 101:S4.Molecular screening of walnut backcross populations for a DNA marker linked to cherry leafroll virus resistance-(Abstract Only) Lynn, N., Leslie, C., Gonzalez, A., Sudarshana, M.R. 2011. Molecular screening of walnut backcross populations for a DNA marker linked to cherry leafroll virus resistance. Phytopathology. 101:S111.A quantitative PCR assay for the detection of phytoplasmas causing almond brownline, peach yellow leafroll, and pear decline diseases in California-(Abstract Only) Sudarshana, M.R., Gonzalez, A., Dave, A.M., Uyemoto, J.K. 2011. A quantitative PCR assay for the detection of phytoplasmas causing almond brownline, peach yellow leafroll, and pear decline diseases in California. Phytopathology. 101:S172.Almond Brownline Disease-(Trade Journal) Sudarshana, M.R. 2011. Almond Brownline Disease. Trade Journal Publication. 17:26-35.Fate of Escherichia Coli 0157:H7 in field-inoculated lettuce.-(Peer Reviewed Journal) Moyne, A., Sudarshana, M.R., Blessington, T., Koike, S.T., Cahn, M.D., Harris, L.J. 2011. Fate of Escherichia Coli 0157:H7 in field-inoculated lettuce. Food Microbiology. doi:10.1016/j.fm.2011.02.001.Characterization of R genes involved in resistance to Cherry leaf roll virus in paradox hybrids-(Research Technical Update) Sudarshana, M.R., Mahmood, N., Rowhani, A. 2011. Characterization of R genes involved in resistance to Cherry leaf roll virus in paradox hybrids. Walnut Research Conference. pp. 245-251.Evaluation of blackline resistant (hypersensitive) cultivars-(Research Technical Update) Caprile, J., Mcgranahan, G., Leslie, C., Sudarshana, M.R. 2011. Evaluation of blackline resistant (hypersensitive) cultivars. Walnut Research Conference. pp. 41-46.GENETICALLY ENGINEERED VIRUS-RESISTANT PLANTS IN DEVELOPING COUNTRIES: CURRENT STATUS AND FUTURE PROSPECTS-(Peer Reviewed Journal) Reddy, D., Sudarshana, M.R., Fuchs, M., Rao, C.N., Thottappilly, G. 2010. GENETICALLY ENGINEERED VIRUS-RESISTANT PLANTS IN DEVELOPING COUNTRIES: CURRENT STATUS AND FUTURE PROSPECTS. Advances in Virus Research. 75:185-220.LETTUCE INFECTIOUS YELLOWS VIRUS-ENCODED P26 INDUCES PLASMALEMMA DEPOSIT CYTOPATHOLOGY-(Peer Reviewed Journal)Biology and Molecular Characterization of Cucurbit leaf crumple virus, an Emergent Cucurbit-Infecting Begomovirus in the Imperial Valley of California-(Peer Reviewed Journal) Hagen, C., Rojas, M.R., Sudarshana, M.R., Xoconostle-Cazares, B., Natwick, E.T., Turini, T.A., Gilbertson, R.L. 2008. Biology and Molecular Characterization of Cucurbit leaf crumple virus, an Emergent Cucurbit-Infecting Begomovirus in the Imperial Valley of California. Plant Disease. 95:5, pp.781-793.  ProjectsImproved Pest and Disease Control for Enhanced Woody Perennial Tree Crop and Grapevine ProductionIn-House Appropriated (D)Accession Number:441857Ecobiology, Impact and Management of Grapevine Red Blotch Virus and Its Vector(s) in California and Oregon VineyardsReimbursable Cooperative Agreement (R)Accession Number:437640 **Research Program:** Dr. Sudarshana has projects on black line disease of walnut, grape leaf roll-associated viruses and necrotic union disorders of stone fruits and grapes.His program includes both applied and molecular biology with emphasis on detection and characterization of new viruses. **Biography:** Dr. Sudarshana received his B.S.(Agri) & M.S. (Agri) with a major in Agricultural Microbiology from the University of Agricultural Sciences, Bangalore India. He received his Ph.D. in Plant Sciences with a major in Plant Pathology in 1995 from the University of Idaho, Moscow, ID. Before commencing his doctoral program, Dr. Sudarshana worked as a research associate at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) in India in the Legumes program where he was associated with studies on aspects of rhizobia and nitrogen fixation by garbanzo beans (chickpea) and development of purification protocals and diagnostics for peanut viruses and provided instructional services in virus diagnostics programs.His doctoral work was on the molecularcharacterization of Tobacco rattle virus, the causal agent of corky ringspot disease in potato tubers, and generation of transgenic potato lines expressing viral genes for pathogen-mediated resistance. After his Ph.D., Dr. Sudarshana moved to UC Davis to work as a post-doctoral fellow on interactions of Bean dwarfmosaic virus and common bean (Phaselous vulgaris) cultivars unravelling the resistance response by the plant host.He also cloned and characterized Cucurbit leaf crumple virus, a new cucurbit virus found in Southern California. In 2001, he joined a privately held plant biotech company in India as a Group Leader in genomics. He returned to UC Davis in 2002 and worked as a staff scientist on biology of Lettuce infectious yellow virus, development of transgenic citrus rootstock for resistance to Citrus tristeza virus by RNAi-mediated silencing, and construction of an inducible Cucumber mosaic virus amplicon for production of plant-based therapeutic proteins. From 2005-2008, Dr. Sudarshana was a research scientist at the Western Institute for Food Safety and Security, at UC Davis, where he conducted studies on the effects of post-harvest storage conditions on the survival and growth of Escherichia coli o157:H7 on lettuce. At various stages in his career, Dr. Sudarshana has provided services to plant health improvement by developing antisera to plant viruses of importance in plant and seed health. Dr. Sudarshana joined the USDA, ARS in 2008.


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