Inheritance of Resistance to Bean Golden Mosaic Virus in Common Bean

Abstract

The inheritance of resistance to bean golden mosaic virus (BGMV) in common bean ( Phaseolus vulgaris L.) was studied in crosses between susceptible bean variety XAN176 and resistant breeding lines 9236-6 (T446/A429) and 9245-94 (DOR303/T968). Disease response data were taken on plants from four generations derived from each cross (parents, F 1 , F 2 , and backcrosses (BCs) of F 1 to both parents) at 25 days after plants were inoculated with BGMV, using whiteflies ( Bemisia argentifolii Bellows & Perring) as vectors. The segregation ratios obtained from F 2 and BC generations were consistent with the hypothesis that resistance in 9236-6, which prevents a chlorotic response, is conferred by a single recessive gene. The disease response in 9245-94 was controlled by two genes—a dominant gene controlling a dwarfing reaction and a recessive resistance gene preventing a chlorotic response to BGMV infection. An allelism test demonstrated that the gene controlling resistance in 9236-6 is nonallelic with the recessive gene controlling resistance in 9245-94. The gene symbol bgm is proposed for the recessive resistance gene (originally from A429) in 9236-6. The gene symbol bgm-2 is proposed for the recessive resistance gene (originally from DOR303) in 9245-94.