Potato germplasm resistant to corky ringspot disease
- 110 Downloads
Potato germplasm was assessed for resistance to corky ringspot disease (CRS) incited by transmission of tobacco rattle virus (TRV). TRV is transmitted by the stubby root nematode,Paratrichodorus allius, in the Pacific Northwest, and characterized by necrotic areas in the tuber. Four tests were conducted at two different problem fields in Umatilla, OR and Pasco, WA. The fields differed in the virulence of the virus isolates. Some clones and named varieties showed resistance only in the field with the relatively mild Umatilla isolate, while others remained symptomless at both sites. The host suitability of test potatoes to threeP. allius populations from the region was determined in greenhouse pot tests, and expressed as reproductive values [Rf = (final population of nematode at 55 days) / (initial population)]. TheR f values for the nematodes were not correlated with resistance ratings based on visual scoring of CRS symptoms in field grown potatoes. Thus, it appears that CRS resistance is based on reaction of potato genotypes to virus and not the vector. The availability of resistant clones inin vitro form is indicated.
Additional Key WordsStubby root nematode Paratrichodorus tobacco rattle virus PotatoSolanum Spraing Rattle
Unable to display preview. Download preview PDF.
- Anonymous. 1996. Charakterystyka zrejonizowanych odmian ziemniaka (Characteristics of registered cultivars of potato). Instytut Zemniaka, Wydanie IV. Bonin, Poland.Google Scholar
- Banttari, E.E., P.J. Ellis, and S.M.P. Khurana. 1993. Management of diseases caused by viruses and viruslike pathogens, pp. 127–133.In: R.C. Rowe (ed.) Potato health management. Am Phytopathol Soc Press, St. Paul, MN.Google Scholar
- Dale, M.F.B. 1989. Advances in breeding for tobacco rattle virus insensitivity in potatoes. Aspects of Applied Biology 22:87–92.Google Scholar
- Hooker, W.J. 1981. Compendium of potato diseases. Am Phytopathol Soc Press. St. Paul, MN.Google Scholar
- Jenkins, W.R. 1964. A rapid centrifugal-flotation technique for separating nematodes from soil. Plant Disease Reporter 48:692.Google Scholar
- Jensen, H.J., P.A. Koepsell, and T.C. Allen. 1974. Tobacco rattle virus and nematode vectors in Oregon. Plant Disease Reporter 58:269–271.Google Scholar
- Mojtahedi, H. and G.S. Santo. 1999. Ecology ofParatrichodorus allius and its relationship to the corky ringspot disease of potato in the Pacific Northwest. American Journal of Potato Research. (In Press).Google Scholar
- Steel, R.D. and J.H. Torrie, 1980. Principles and procedures of statistics: A biometrical approach. McGraw-Hill Book Co. New York, NY, USA. 633 pp.Google Scholar
- Weingartner, D.P. and R. McSorley. 1994. Management of nematodes and soil-borne pathogens in subtropical potato production. Pp. 202–213In: G.V. Zehnder, M.L. Powelson, R.K. Jansson, K.V. Raman (eds.) Advances in potato pest biology and management. American Phytopathological Society Press, St. Paul, MN.Google Scholar