Registration of Common Bean Pinto PRP 153 and VCP 13 with High Levels of Broad‐Spectrum White Mold Resistance

Abstract

Common bean (Phaseolus vulgaris L.) pinto breeding lines PRP 153 (Reg. No. GP‐300, PI 676973) and VCP 13 (Reg. No. GP‐301, PI 676974) possess high levels of broad‐spectrum (i.e., combining two or more sources of resistance) resistance to white mold [caused by Sclerotinia sclerotiorum (Lib.) de Bary]. Both breeding lines were jointly developed at the University of Idaho, Kimberly Research and Extension Center and Colorado State University, Fort Collins. VCP 13 was derived from an interspecific recurrent backcross population between common bean pinto ‘UI 320’ and P. coccineus PI 439534 (UI 320*2/PI 439534). PRP 153 was selected from the double‐cross USPT‐WM‐1/CORN 601//USPT‐CBB‐1/92BG‐7. PRP 153 and VCP 13 have significantly (P ≤ 0.05) higher levels of resistance (mean disease scores ranging from 3.0 to 3.7) than previously reported in common bean to S. sclerotiorum isolates ARS12D, ARS14D, ARS14M, ARS15T, CO467, ND710, and NY133. PRP 153 also has resistance to the less‐aggressive strain ARX8AC of the common blight pathogen, Xanthomonas campestris pv. phaseoli Smith (Dye). Both lines have an indeterminate prostrate growth habit Type III. They are late maturing, requiring 100 d or longer from planting to harvest maturity in southern Idaho. White mold resistance from PRP 153 and VCP 13 should be combined together with other contrasting and complementary sources of resistance to breed for yet higher levels of broad‐spectrum resistance and/or introgressed into common bean cultivars of different market classes to combat white mold disease in the United States and elsewhere.