Genetics of stem rust resistance in four bread wheat cvs. HD2733, HD2768, HD2781 AND HD2784.

摘要

The nature of inheritance of resistance to stem rust (Puccinia graminis f.sp. tritici) of wheat in 4 bread wheat cultivars was studied in New Delhi, India, from 2002-03 to 2005-06 rabi seasons. The genetic analysis confirmed 3 dominant genes for resistance to stem rust in HD2768, 2 dominant independent genes each for resistance in HD2733 and HD2784 and one dominant gene in HD2781. Analysis of BC₁ and BC₂ with pathotype 122 (7G11) confirmed the above number of genes. F₂ segregation of intercrosses HD2733 x HD2781 and HD2781 x HD2784 showed different genes for resistance in the above cultivars. An adult plant resistant gene (Sr2) was also identified in HD2733, HD2781 and HD2784 based on mottling effect on the seedlings.