Genetic Control Of Resistance To Stem Rust In Durum Wheat Introgressive Lines Derived From Triticum Timopheevii Zhuk.
Abstract
L. P. Khlebova, N. V. Barysheva
Breeding for long-lasting resistance to pathogens in cultivated crops is possible only in the presence of various donors of immune genes. Distant hybridization is considered as the main way to solve strategic tasks in this direction. Tetraploid endemic wheat Triticum timopheevii Zhuk. has a complex immunity to harmful fungal diseases and can be a valuable source of useful genes to create immune wheat varieties. A genetic analysis of the factors determining the resistance to Puccinia graminis Pers. f. sp. tritici Erikss. et Henn. in three durum wheat introgressive lines derived from T. timopheevii has been carried out. The study of the genetic control of resistance to stem rust was performed by hybridological analysis in F1 – F3 hybrid generations derived from the crossing immune lines with an initial variety of durum wheat. Infectious background was created in the experimental field by inoculating plants at tillering stage with race 17. We discovered three genes have determined the resistance in both HT-10 and HT-12 lines: one dominant, one recessive and one dominant complementary to the first two genes. HT-7 line carries in its genome four genes: two dominants, one semi dominant providing the resistance at complementary interaction with another dominant gene. Independent inherited factors of resistance to stem rust in T. timopheevii are localized in different linkage groups, exhibiting homology with the durum wheat chromosomes. The possibility of the using new sources of resistance to protect wheat crops from plant pathogens was discussed.
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