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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 659069 | USCR-CBB-20 | Phaseolus vulgaris L. | Washington, United States | W6 | | | 2010 | DEVELOPED | 2008 | | | | | Breeding material | Common bacterial blight (CBB) is a serious disease of dry and green beans (Phaseolus vulgaris L.) in warm humid climates. The disease is most prominent east of the continental divide in the U.S. Beans from the Andean gene pool, such as the cranberry dry bean market class, are very susceptible to CBB. Our objective was to develop a cranberry dry bean with improved resistance to CBB. A combination of marker-assisted selection for resistance QTL in early generations, followed by selection under disease pressure in later generations, was used to develop the cranberry dry bean germplasm line USCR-CBB-20 with improved resistance to CBB. USCR-CBB-20, released in 2008 by USDA-ARS in cooperation with the Idaho (IAES) and Michigan (MAES) Agricultural Experiment Stations, possesses SCAR markers SU91 and SAP6 associated with CBB resistance QTL on linkage groups 8 and 10. USCR-CBB-20 had an average disease score of 5.3 in greenhouse tests, which is a remarkable improvement over the previous cranberry germplasm line released with CBB resistance which scored 8.4 (note 9 is completely susceptible) in the same tests. Except for small seed size, USCR-CBB-20 exhibits commercially acceptable agronomic traits for the cranberry bean market class. Yield potential was above average in Michigan and below average in Washington. USCR-CBB-20 will be useful for improving CBB resistance in the cranberry, and other large-seeded dry bean market classes of Andean origin. | 1831960 | PI 659069 |