Registration of Great Northern Common Bean Cultivar ‘Coyne’ with Enhanced Disease Resistance to Common Bacterial Blight and Bean Rust

Abstract

Great northern common bean ( Phaseolus vulgaris L.) ‘Coyne’ (Reg. No. CV‐287, PI 655574) was developed by the dry bean breeding program at the University of Nebraska Agricultural Research Division and released in 2008. It was bred specifically for adaptation to Nebraska growing conditions and for enhanced resistance to common bacterial blight (CBB), a major disease of common bean caused by the seed‐borne bacterium Xanthomonas campestris pv. phaseoli (Smith) Dye, and bean common rust Uromyces appendiculatus (Pers.:Pers) Unger. Coyne is a great northern F 7 : 8 line derived from a three‐way cross (G95023/Weihing//BelMiNeb‐RMR‐11). The first cross was made in winter 2003. The F 7:8 was tested in advanced yield trials at Scottsbluff and Mitchell, NE, and in growers' fields in Nebraska. Yield of Coyne was only 47 kg ha −1 lower than ‘Marquis’ in Morrill and Scotts Bluff, NE, counties. Reaction of Coyne to CBB under field conditions was consistent across 3 yr at the West Central Research and Extension Center, North Platte, NE, where field disease ratings of 3.2, 3.5, and 4.4 were recorded in 2005, 2006, and 2007, respectively. Coyne has the 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 Bean common mosaic virus Coyne has bright white seed, blooms 44 d after planting, and is a midseason bean, maturing 91 d after planting.