INHERITANCE OF RESISTANCE TO WHITE LUPIN MOSAIC-VIRUS IN COMMON PEA

Resistance to white lupin mosaic virus (WLMV), a recently characterize d member of the potyvirus group, was found in pea (Pisum sativum L.) p lant introductions from Ethiopia (PI 193835) and India (PI 347485). In cross and backcross populations between plants of resistant PI 193835 with those of susceptible 'Bonneville' and PP-492-5, this resistance was demonstrated to be governed by a single recessive gene. This gene was distinct from other genes previously found in PI 193835 and PP-492 -5 (from PI 347492, India) conferring resistance to clover yellow vein virus (CYVV) and three strains of pea seedborne mosaic virus (PSbMV). Indirect evidence suggests that this newly recognized viral resistanc e gene, wlv, is a member of a cluster of closely linked genes located on chromosome 6. This gene cluster includes sbm-1, sbm-3, and sbm-4, w hich govern resistance to three PSbMV pathotypes, and cyv-2, which gov erns resistance to CYVV.