Mapping of Aegilops umbellulata ‐derived leaf rust and stripe rust resistance loci in wheat

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Abstract

Aegilops umbellulata , a non‐progenitor diploid species, is an excellent source of resistance to various wheat diseases. Leaf rust and stripe rust resistance genes from A. umbellulata were transferred to the susceptible wheat cultivar WL 711 through induced homoeologous pairing. A doubly resistant introgression line IL 393‐4 was crossed with wheat cultivar PBW 343 to develop a mapping population. Tests on BC 2 F 7 RIL s indicated monogenic inheritance of seedling leaf rust and stripe rust resistance in IL 393‐4 and the respective co‐segregating genes were tentatively named LrUmb and YrUmb . Bulked segregant analysis placed LrUmb and YrUmb in chromosome 5 DS , 7.6 cM distal to gwm190 . Aegilops geniculata ‐derived and completely linked leaf rust and stripe rust resistance genes Lr57 and Yr40 were previously located in chromosome 5 DS . STS marker Lr57 / Yr40 MAS ‐ CAPS 16 ( Lr57 / Yr40‐ CAPS 16 ), linked with Lr57 / Yr40 (T756) also co‐segregated with LrUmb / YrUmb . Seedling infection types differentiated LrUmb from Lr57 . Absence of leaf rust‐susceptible segregants among F 3 families of the intercross ( IL 393‐4/T756) indicated repulsion linkage between LrUmb and Lr57 . YrUmb expressed a consistently low seedling response under greenhouse conditions, whereas Yr40 expressed a higher seedling response. Based on the origin of LrUmb / YrUmb from the U genome and Lr57 / Yr40 from the M genome, as well as phenotypic differences, LrUmb and YrUmb were formally named Lr76 and Yr70 , respectively. These genes have been transferred to Indian wheat cultivars PBW 343 and PBW 550, and advanced breeding lines are being tested in state and national trials.

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