Additional index words. Phaseolus vulgaris, rust, common bacterial blight, halo blight, bacterial brown spot, white mold The release of 'Chase' fulfills a need in southwestern Nebraska for a Pinto dry bean cultivar (Phaseolus vulgaris L.) with resistance to rust [Uromyces appendiculatus (Pers.) Unger] and several bacterial diseases. Rust, common bacterial blight [Xanthomonas campestris pv. phaseoli (Smith) Dye], and bacterial brown spot (Pseudomonas syringae pv. syringae van Hall) diseases have recently reduced bean yields and seed quality of Pinto dry beans in that region and northeastern Colorado. 'Chase' is the first Pinto cultivar that combines resistance to rust(races of rust prevalent in recent years in Nebraska and Colorado), bacterial brown spot, halo blight [P. syringae pv. phaseolicola (Burkholder)], moderate resistance to common blight, and moderate avoidance of white mold [Sclerotinia sclerotiorum (Lib.) de Bary] due to a porous canopy. 'Chase' also has resistance to potato leafhopper "bum" injury caused by Empoasca fabae Harris.
OriginWe deemed it important to develop an early maturing Pinto line with resistance to rust and common blight and with moderate avoidance to white mold. 'Chase' (evaluated as PWM 2 -89-5 from 1989 to 1992) was derived by pedigree selection (Fig. 1) from a cross of a Nebraska (NE) Great Northern (GN) breeding line GN WM 2 -84-17 (upright plant habit, moderately early, resistant to common bacterial blight and rust, and moderate avoidance of white mold) and a NE Pinto (P) breeding line PWM 2 -84-45 (prostrate habit, early maturity, good Pinto seed size and shape, rust-
Great northern common bean (Phaseolus vulgaris L.) germplasm line ABC‐Weihing (Reg. No. GP‐246, PI 647964) was developed by the University of Nebraska Agricultural Research Division in cooperation with USDA‐ARS and released in 2006. This line, tested as NE1‐05‐4, was bred specifically for enhanced resistance to common bacterial blight (CBB), a major seed borne disease of common bean caused by the bacterium Xanthomonas campestris pv. phaseoli (Smith) Dye (Xcp). ABC‐Weihing is a great northern BC5F3:6 line obtained from five backcrosses (‘Weihing’*5//‘Chase’/XAN 159). The first cross was made in spring 1997. Only BCnF1 plants resistant to Xcp isolates Dominican Republic DR‐7 and Nebraska SC4A, as determined by multiple needle leaf inoculation tests in the greenhouse, were used for successive backcrossing. In addition to phenotypic selection for CBB resistance, marker‐assisted selection for the resistant QTL‐linked marker SU91 was conducted in the BC1F1, BC2F1, and ABC‐Weihing. When inoculated with Nebraska Xcp strains in the field, ABC‐Weihing exhibited resistance in both 2005 and 2006. ABC‐Weihing has Ur‐3 and Ur‐6 genes for resistance to common bean rust and carries the single dominant hypersensitive I gene that provides resistance to all non‐necrotic strains of the Bean common mosaic virus (BCMV). ABC‐Weihing has bright white seed, blooms 45 d after planting, and is a midseason bean maturing 92 d after planting.
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