Inheritance of Wheat Streak Mosaic Virus Resistance in KS03HW12

Wheat streak mosaic caused by Wheat Streak Mosaic Virus (WSMV) is a serious disease in wheat (Triticum aestivum L.). Use of cultivars with the WSMV resistance is a primary and effective way to control this disease. 'KS03HW12' is a newly discovered wheat line with the WSMV resistance. This study was conducted to determine the inheritance of WSMV resistance in KS03HW12 and its allelic relationship with a known resistance gene Wsm2. KS03HW12 was crossed to a susceptible line 'KS04HW87' and a resistant cultivar 'RonL' having the Wsm2 to obtain F1 and F2. Seedlings of parents, susceptible check, F1 and F2 were artificially inoculated and evaluated for WSMV reaction at 18oC in a growth chamber. A total of 144 F2:3 family lines from the cross of KS03HW12 x KS04HW87 were further evaluated for WSMV reaction. Data from the cross of KS03HW12 x KS04HW87 indicated a two-gene with recessive epistasis model for the WSMV resistance in KS03HW12. The F2 segregation ratio in the cross of KS03HW12 x RonL suggested there are different resistance genes between KS03HW12 and RonL. Therefore, resistance genes in KS03HW12 and RonL could be stacked to produce durable resistance.