New additions to sources of resistance to bacterial spot and field performance of HR gene NILs in Capsicum pepper.

Two introductions from Laos, KC01327 and KC01328, and one introduction from Nepal, KC00897, were as resistant to bacterial spot as previously reported sources of resistance to bacterial spot (Xanthomonas campestris pv. vesicatoria) in pepper (Capsicum annuum) such as KC00177 (PI163192), KC00046 (PI244670), KC00079 (PI271322), KC00127 (PI369994), KC00995, KC00997, and KC01006. The sources of resistance were nonspecific to pathotypes of the bacterial spot pathogen. Near-isogenic lines (NIL) of hypersensitive resistance (HR) genes developed by incorporation Bs2 and Bs3 into ‘Chilseong’ reacted differentially to race 1 and race 3 of the bacterial spot pathogen. Bs2 NILs were hypersensitive to both race 1 and race 3 but Bs3 NILs were resistant to race 1 but susceptible to race 3. The differential reaction of the NILs was clearly observed in the field when transplanted to the field after inoculation with both races.