Resistance to powdery mildew (Erysiphe graminis f.sp. hordei) in the barley cultivar Galleon. I. Relationship with known genes for resistance
Tóm tắt
A study was undertaken into the nature and number of resistance genes in the barley cultivar Galleon against powdery mildew (Erysiphe graminis f.sp. hordei) and the relationship of this resistance with other known resistance genes. The reactions of F1s, F2s, F3s, and test-cross progenies from crosses of Galleon with three susceptible cultivars (Weeah, Clipper and Sonja) to isolates of the pathogen made in South Australia showed that the resistance in Galleon is conditioned by a single dominant gene in some plants and two dominant genes in other plants. Thus Galleon is a mixture of genotypes differing in reaction to powdery mildew. When crossed to parents containing known resistance genes both the single dominant gene (in Galleon Selection) and the two dominant genes (in unselected Galleon) segregated independently in F2s and test-cross progenies. Analysis of the 1-1 values indicate that the gene(s) in Galleon are definitely different from M1-g, located on chromosome 4, M1-h on chromosome 6, and from M1-ra and M1-k which were ineffective in this study. Differences from M1-a, M1-a7, M1-a9 and M1-a12 were of a lower probability indicating linkage. The gene M1-a6 was ineffective in South Australia but the cultivar Midas and its progeny were resistant indicating the presence of a previously undescribed gene. The reaction types of the Galleon genes also showed differences from the M1-(CP), M1-p, M1-v and m1-o3 genes as well as the above nine genes. The resistance gene in the Galleon Selection is tentatively designated M1-(Ga). There is as yet no evidence to determine whether this gene is different from either of the genes in the unselected Galleon.
Tài liệu tham khảo
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