Performance of four new leaf rust resistance genes transferred to common wheat from Triticum tauschii and T. monococcum
2000
Hussien, T. (Alemaya University, Dire Dawa (Ethiopia))
The diploid progenitors of hexaploid common wheat (Triticum aestivum L. AABBDD), tauschii (DD) and T. monococcum (AA), are valuable sources of genes for resistance to the leaf rust fungus (Puccinia recondita f.sp. tritici). In this study, four new leaf rust resistance genes previously transferred from these species to common wheat were considered. The gene Lr43, occurring in the wheat line KS92WGRC16, was transferred from A. tauschii. One gene, occurring in the wheat line KS92WGRC23, was transferred from T. monococcum var .monococcum. Two other genes, occurring in the wheat lines KS93U3 and KS93UI80, were obtained from T. monococcum var. boeoticum. The genes in KS92WGRC23 and KS92WGRC16 were resistant in both Kansas and Texas field tests. The gene in KS93U3 was moderately resistant in Kansas but moderately resistant to moderately susceptible in Texas. The gene in KS93U180 was moderately resistant in Kansas but moderately resistant to susceptible in Texas. Adult plant tests conducted in the greenhouse using isolate CBBQ indicated that KS92WGRC23, KS92WGRC16, and KS93UI80were highly resistant but KS93U3 gave a moderately resistant reaction. Typical seedling infection types produced by these lines were zero (0), fleck (), fleck associated with chlorosis (C), and heterogeneous (X). Results of growth chamber studies at different temperatures (12, 16, 20 and 24°C) showed slight temperature effects on the expression of KS93UI80, only. The genes in the four lines should be used in combination with other resistance genes to prolong their usefulness.
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