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Assessment of the field resistance of potato genotypes with major gene resistance to late blight (phytophthora infestans (mont.) de bary) using inoculum comprised of two complementary races of the fungus
Ist Teil von
Potato research, 2001-03, Vol.44 (1), p.41-52
Ort / Verlag
Wageningen: European Association for Potato Research
Erscheinungsjahr
2001
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 R^sub 10^ and R^sub 2^ 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.[PUBLICATION ABSTRACT]