Location: Peanut and Small Grains Research UnitTitle: Pest resistance discovery and introgression
Submitted to: Agricultural Experiment Station Publication
Publication Type: Experiment Station
Publication Acceptance Date: 12/1/2019
Publication Date: 3/8/2020
Citation: Xu, X. 2020. Pest resistance discovery and introgression. Agricultural Experiment Station Publication. 1058:12-18.
Technical Abstract: Greenbug, powdery mildew and leaf rust pose serious threats to wheat production, and resistance sources are needed for wheat improvement. The new greenbug resistance gene Gb8, powdery mildew resistance gene Pm65 and leaf rust resistance gene Lr622111 were identified in wheat reselection line PI 595379-1, Chinese cultivar Xinmai208 and Iranian landrace PI 622111, respectively. Linkage analysis placed Gb8 in a 2.7-Mb interval in the terminal bin of chromosome 7DL (7DL3-082-1.0), spanning 595.6 to 598.3 Mb in the IWGSC RefSeq v1.0 reference sequence, while Pm65 was mapped to a 0.5 cM interval covering 531.8 Kb (763,289,667–763,821,463 bp) on chromosome 2AL in the reference sequence. Lr622111 was harbored in an interval of 1.1 Mb flanked by SSR markers Xstars669 (6.5 Mb) and Xstars678 (7.6 Mb) in the terminal region of chromosome 5BS.Gb8, Pm65 and Lr622111 confer resistance to predominant U.S. greenbug biotypes, leaf rust races and powdery mildew isolates, respectively, and are valuable resistance sources for wheat breeding.