Abstract
(...) Resistant inbred lines B68, Oh1EP, Oh7B, and Pa405 (the B68 group) behaved homogeneously for virus reactions as lines and the F 1 of crosses with susceptible line Va50 produced only type 1 plants. In the F 2 , resistance was monogenic and completely dominant. Since no infected plants were observed in F 2 of crosses of lines within the B68 group, resistance occurred at one locus. The symbol Rmd1 is suggested for this locus. The resistant inbred lines A239, Va53, Va85, and VaOM73 (the Va53 group) produced only type 1 plants, but in the F 1 of crosses with Va50, produced some susceptible plants; however, in F 2 all segregated monogenically. In the F 2 of crosses within the Va53 group and between the Va53 and B68 groups, susceptible segregates appeared (...)
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