Utilizing Bdv2, the Thinopyrum intermedium Source of BYDV Resistance, to Develop Wheat Cultivars

摘要

Barley yellow dwarf (BYD) is of considerable economic significance worldwide, particularly in higher rainfall regions where the aphid vector itself is problematic. Yield losses in wheat have been reported to be as high as 40-50% (El Yamani, 1990; Banks et al, 1995a; McKirdy and Jones 1997; Herbert et al, 1999; Riedell et al, 1999). We have sought to find sources of resistance that can be made available for wheat improvement. Thinopyrum intermedium (host) Barkworth and Dewey, also known as Agropyron intermedium, Elytrigia intermedia, or intermediate wheatgrass, carries BYDV resistance genes on a group 7 chromosome (7Ail, Brettell et al., 1988; Friebe et al, 1992) and a group 2 chromosome (Larkin et al, 1995; Tang et al, 2000). The group 7 chromosomecarrying BYDV resistance was first identified in a 2n=44 disomic addition line called LI; the resistance is located on the long arm (Brettell et al, 1988).