XVI International Botanical Congess

Two types of cytoplasms, msm1 and msm2, derived from Hordeum spontaneum are recognized to cause cytoplasmic male sterility in barley. There is no report whether these cytoplasms carry the effect on disease resistance. We investigated the reaction of alloplasmic substitution lines with msm1 or msm2 to three types of BaYMV. Both of the alloplasmic substitution lines with two types of genetic background, Adorra (susceptible to BaYMV- T, U, V) and Misato Golden (resistant to BaYMV- T, U), showed same reaction to each virus with euplasmic control. A msm1 alloplasmic substitution line of Adorra, which have a restore gene, showed the same reaction as Adorra. These data demonstrated that the nuclear gene controlled resistance to BaYMV without cytoplasmic effect.