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Title: Registration of Partial White Mold Resistant Pinto Bean Germplasm Line USPT-WM-1

item Miklas, Phillip - Phil

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/4/2006
Publication Date: 10/5/2006
Citation: Miklas, P.N., Grafton, K.F., Hauf, D., Kelly, J.D. 2006. Registration of Partial White Mold Resistant Pinto Bean Germplasm Line USPT-WM-1. Crop Science.46:2339

Interpretive Summary: White mold is the most devastating disease of dry bean in the U.S. Every production region across 14 states is affected by the disease. Integrated strategies for management of the disease include cultural practices and fungicides. Genetic resistance has potential for partial control of the disease but has not been developed for many of the more susceptible market classes like pinto, pink, and great northern. Here we report the development of a pinto bean line with partial resistance to white mold. It is the first pinto bean developed with such resistance and has been highly sought after by breeders from the public and private sector in the U.S. and overseas. USPT-WM-1 will be most useful for incorporating partial resistance to white mold primarily in the pinto bean market class, but also in the medium-seeded great northern, pink, and small red market classes as well. This resistance will contribute to improved control of white mold disease leading to enhanced yield, better maintenance of product quality, and reduced dependency on expensive fungicides.

Technical Abstract: Pinto bean germplasm line USPT-WM-1 was developed by USDA-ARS in cooperation with the North Dakota State Agricultural Experiment Station and the Agricultural Experiment Station of Michigan State University and released in 2005. This line was bred specifically for resistance to white mold caused by the fungal pathogen Sclerotinia sclerotiorum (Lib.) deBary. White mold is the major economic disease problem of dry bean production in the U.S., and is a particularly severe problem in pinto beans due to their high degree of susceptibility to the disease. White mold is endemic in all production regions of the U.S., and is most problematic under moist conditions resulting from rainfall or excessive irrigation during the flowering and mid-pod fill stages. The partial resistance in USPT-WM-1 derives from ICA Bunsi navy bean (synonymous with Ex Rico 23 in Canada), which is a well-known source of resistance to white