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Summary Two races ofPhytophthora infestans, differing in virulence against four major (R) genes for resistance, were used to assess the field resistance of differential
(R) genotypes, both singly and mixed together in equal proportions. The mixed inoculum led to an over-estimation of the foliage
resistance of genotypes with which only one of the races was compatible, by up to two scoring categories of a 1–9 scale in
field trials and, to a lesser extent, in glasshouse tests depending on the differential and the test. Assessment of tuber
resistance was not significantly affected. The R10 and R2 differentials showed a higher level of field resistance in the foliage and tubers, respectively, than the other genotypes.
It is concluded that assessments of genotypes which may possess R genes, using mixed inoculum, should be interpreted with
caution, and apparent high levels of field resistance confirmed through genetic studies of the inheritance of the resistance. 相似文献