Registration of Seven Winter Wheat Germplasm Lines Carrying the Wsm1 Gene for Wheat Streak Mosaic Virus Resistance

Seven winter wheat (Triticum aestivum L.) germplasm lines carrying the Wsm1 gene conferring resistance to Wheat streak mosaic virus (WSMV)-Alliance-Wsm1 (Reg. No. GP-858, PI 653710), Arrowsmith-Wsm1 (Reg. No. GP-859, PI 653711), Goodstreak-Wsm1 (Reg. No. GP-860, PI 653712), Harry-Wsm1 (Reg. No. GP-861, PI 653713), Millennium-Wsm1 (Reg. No. GP-862, PI 653714), Wahoo-Wsm1 (Reg. No. GP-863, PI 653715), and Wesley-Wsm1 (Reg. No. GP-864, PI 653716)-were codeveloped by Washington State University, Pullman, WA; the University of Nebraska, Lincoln, NE; and the USDA-ARS. These seven different winter wheat cultivars were selected to provide more sources of effective resistance to WSMV in winter wheat cultivars of Nebraska and adjoining states. Resistance to WSMV is conferred by the Wsm1 gene, which was translocated from Thinopyrum intermedium (Host) Barkworth & D.R. Dewey [Agropyron intermedium (Horst.) Beauv.] into wheat. The STSJ15 marker was used to select for the gene in the backcross progeny until the BC(4)F(1) generation. In BC(4)F(2) generation, screening for disease resistance was done using the Sidney 81 isolate of WSMV, along with the recurrent parents. Lines showing high levels of resistance to WSMV were further selected for seed increase and field evaluation. These lines may serve as a winter wheat source of WSMV resistance and may be used for gene pyramiding and for studying the effect of the Wsm1 gene in different backgrounds.