Wild tuber-bearing species ofSolanum and incidence ofPhytophthora infestans (Mont.) de Bary on the Western slopes of the volcano Nevado de Toluca. 5. Type of resistance toP. infestans |
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Authors: | A. Rivera-Peña |
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Affiliation: | (1) Instituto Nacional de Investigaciones Forestales y Agropecuarias (INIFAP), Secretaria de Agricultura y Recursos Hidraulicos (SARH), Ave. Insurgentes Sur No. 694, CP 03100, Mexico City, Distrito Federal, México;(2) Present address: Centro de Investigaciones Forestales y Agropecuarias Estado de México, Campo Experimental Toluca, Apartado Postal 487, Toluca, México |
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Abstract: | Summary Plants of wildSolanum species (S. demissum (dms), S. verrucosum (ver), S. iopetalum (iop), S. brachycarpum (bra), and an unidentified species (unsp), from the natural habitat were inoculated in the laboratory withPhytophthora infestans race 0, to see if major genes for resistance were present, and with the most complex and aggressive race available in an attempt to reveal the level of general resistance. No plant with a susceptible reaction to race 0 was found in 120 plants ofdms, and 34 plants ofunsp. Plants with a hypersensitive reaction to race 0 and susceptible plants were found inver. When infected with a complex aggressive isolate of the fungus 73.5% of the WSS plants were susceptible. It was concluded that WSS in the area possess both complex race specific resistance and a high level of general resistance, whose effects cannot yet be separated. |
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Keywords: | specific resistance general resistance late blight Solanum demissum Solanum verrucosum Solanum iopetalum Solanum brachycarpum Solanum x edinense |
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