A wheat–Thinopyrum ponticum–rye trigeneric germplasm line with resistance to powdery mildew and stripe rust

Abstract

An individual plant, line 0-123-1-1 with the chromosome number 2n = 42 was obtained in the BC3F4 progeny of a cross between a wheat 1BL.1RS translocation line 48112 and wheat–Thinopyrum ponticum partial amphiploid BE-1. Molecular markers specific for 1RS, Glu-B3, and the T. ponticum genome specific marker SCAR982 revealed that the line was trigeneric having alien chromatin from both T. ponticum and rye. Resistance tests with mixed races of Blumeria graminis f. sp. tritici and an individual race of Puccinia striiformis at the seedling and adult stages revealed that 0-123-1-1 was immune to powdery mildew and stripe rust for the whole growth period. High levels of disease resistance and good and stably agronomic traits make the 0-123-1-1 line a good germplasm for breeding in wheat.