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Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Trade Journal Publication Acceptance Date: 1/31/2003 Publication Date: 4/30/2003 Citation: Singh, S.P., Teran, H., Gutierrez, J.A., Pastor-Corrales, M.A., Schwartz, F., and Morales, F.J. 2003. Registration of A 339, MAR 1, MAR 2, and MAR 3 angular leaf spot resistance common bean germplasm. Crop Science. Accepted for publication. 43:1886-1887. Interpretive Summary: The ARS-USDA Bean Project at Beltsville has released, in collaboration with the Michigan and North Dakota Agricultural Experiment Stations and the University of Nebraska, 25 pinto, 15 great northern, and 12 navy dry bean germplasm lines since 1998. All of these bean lines are unique; they contain various combinations of disease resistance genes that protect them against most strains of the hypervariable rust fungus and the bean common mosaic necrosis viruses. The rust pathogen and the mosaic viruses cause economically important diseases that reduce yields and seed and pod quality. In addition to disease resistance, the released bean lines are high yielding,, upright, and have commercial seed color and other desirable agronomic attributes. Plant breeders in industry and state universities in the United States and other countries of the world use these lines to improve their locally adapted dry bean varieties. Some of the lines have also been released as commercial dry bean varieties. This manuscript summarizes these developments and is of value to scientists working towards improving bean quality and yield. Technical Abstract: This publication lists the sources and genes for resistance used in the development of 52 high yielding, rust and mosaic resistant dry bean germplasm lines. The ARS-USDA Bean Project at Beltsville developed these bean lines in collaboration with the Michigan and North Dakota Agricultural Experiment Stations and the University of Nebraska. The released bean germplasm lines include 25 pinto; 15 great northern and 12 navies. These are some the most important dry bean commercial classes produced in the U.S. Although several rust and mosaic resistance genes are available for the development of disease resistant dry bean, these released lines contain various combinations oftheUr-3, Ur-4, Ur-6, and U-11 rust resistance genes and of the dominant I and recessive bc-11, bc-22, and bc-3 mosaic resistance genes. All but two of the 52 lines released contain combinations of two, three and four genes for rust resistance and one or two genes for resistance to bean common and bean common mosaic necrosis viruses. The most recently released pinto and great northern lines are the only beans in the world that contain four genes for resistance to rust and two genes for mosaic resistance and are the only bean lines of any kind that are resistant to all strains of the highly variable bean rust and bean common mosaic viruses in the world. |
