Summary
The phytotoxic components of the culture filtrate of the fungusAlternaria solani Sor, which causes early blight in potato, were used in this study to differentiate between resistant and susceptible genotypes selected to represent a range of reactions when screened in the field. Detached leaflet assays, using spores and toxic metabolites from the culture filtrate, were compared with field ratings and a whole-plant glasshouse test. Rank correlations between several detached leaflet tests were highly significant (P<0.01) but the correlations between these tests and the glasshouse and field tests were poor. The disease ratings obtained in the various tests were clustered into four groups and assigned to resistance classes. For many of the genotypes there was a good correspondence between resistance classes for all test methods. Divergent results between tests were associated with foliage maturity characteristics of the genotypes.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Caligari, P.D.S. & A. Nachmias, 1988. Screening for field resistance to early blight (Alternaria solani) in potatoes.Potato Research 31: 451–460.
Frank, J.A., R.E. Webb & D.R. Douglas, 1979. Evaluation of several USDA potato clones for resistance to early blight.Plant Disease Reporter 63: 392–394.
Handa, A.K., R.A. Bressan, M.L. Park & P.M. Hasegawa, 1982. Use of plant cell cultures to study production and phytotoxicity ofAlternaria solani toxin(s).Physiological Plant Pathology 21: 295–309.
Ichihara, A., H. Tazaki & S. Sakamura, 1983. Solanapyrones A, B, and C, phytotoxic metabolites from the fungusAlternaria solani.Tetrahedron Letters 24: 5373–5376.
Lynch, D.R., 1989. Progress report of the Prairie potato regional trials. Agriculture Canada, Research Station, Lethbridge, Alberta, Canada, 67 pp.
Malcolmson, J.F., 1976. Assessment of field resistance to blight (Phytophthora infestans) in potatoes.Transactions of the British Mycological Society 67: 321–325.
Matern, U., G. Stroebel & J. Shepard, 1978. Reaction to phytotoxins in a potato population derived from mesophyll protoplasts.Proceedings of the National Academy of Science USA 75: 4935–4939.
Nachmias, A., P.D.S. Caligari, G.R. Mackay & L. Livescu, 1988. The effects ofAlternaria solani andVerticillium dahliae on potatoes growing in Israel.Potato Research 31: 443–450.
Steel, R.G.D. & J.H. Torrie, 1960. Principles and procedures of statistics. McGraw Hill Book Col. Inc., USA, 481 pp.
Stewart, H.E., 1990. A glasshouse test for assessing resistance to early blight (Alternaria solani). Abstracts of Conference Papers and Posters of the 11th Triennial Conference of the European Association for Potato Research, Edinburgh, 257–258.
Teng, P.S. & H.L. Bisonette, 1985a. Estimating potato yield responses from chemical control of early blight in Minnesota.American Potato Journal 62: 595–606.
Teng, P.S. & H.L. Bisonette, 1985b. Potato yield losses due to early blight in Minnesota fields, 1981 and 1982.American Potato Journal 62: 619–627.
Ward, J.H., 1963. Hierarchial grouping to optimize an objective function.Journal of the American Statistical Association 58: 236–244.
Author information
Authors and Affiliations
Additional information
Contribution no. 3879050 of the Lethbridge Research Station.
Rights and permissions
About this article
Cite this article
Lynch, D.R., Wastie, R.L., Stewart, H.E. et al. Screening for resistance to early blight (Alternaria solani) in potato (Solanum tuberosum L.) using toxic metabolites produced by the fungus. Potato Res 34, 297–304 (1991). https://doi.org/10.1007/BF02360503
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02360503