Registration of Common Bean Pinto US14HBR6 Resistant to Race 6 of the Halo Blight Pathogen, Pseudomonas syringae pv. phaseolicola

Halo blight, caused by Pseudomonas syringae pv. phaseolicola (Burkholder) (Psp), is a seed-borne bacterial disease of common bean (Phaseolus vulgaris L.) that is found worldwide, particularly in temperate climates, such as in the midwestern United States. Under favorable conditions, halo blight has been reported to cause up to 45% losses on susceptible cultivars. Nine Psp races have been identified on the basis of the interaction with a series of differentials possessing different combinations of resistance (R) genes. To date, high levels of resistance have been identified for all Psp races with the exception of race 6, which is becoming more prevalent (e.g., in the midwestern United States). Here, we report a source of resistance to Psp race 6 in pinto US 14 (PI 549748). Initially, plants derived from the original US 14 seed stock were variable for their resistance reaction. Thus, a pureline with resistance to Psp race 6, hereafter referred to as US14HBR6 (Reg. No. GP-293, PI 666939), was jointly developed at the University of California, Davis and University of Idaho, Kimberly, through repeated individual plant selections and progeny tests performed under severe halo blight disease pressure. Pinto US14HBR6, like US 14, has an indeterminate prostrate growth habit Type III, white flowers, and 100-seed weight of 23 g. US14HBR6 matures in approximately 95 d in southern Idaho. © Crop Science Society of America. All rights reserved.