1a.Objectives (from AD-416):
To evaluate, characterize, and improve common bean genetics for biological nitrogen fixation.
1b.Approach (from AD-416):
ARS will acquire germplasm, conduct field studies, and perform genetic analysis; WSU will provide graduate student support and expertise on characterization of soils and rhizobium strains.
Two hundred and twenty-five lines were tested under low fertility and drought in Fall 2012 in Washington in Spring 2013 in Tanzania. Progress was made for Subobjective 1B: Develop dry bean germplasm with enhanced disease and/or abiotic stress resistance using MAS in combination with traditional breeding approaches, as a few lines with combined tolerance to low fertility and drought were identified. Three hybridizations made between contrasting susceptible and tolerant lines were advanced during the summer 2013 season to initiate development of populations for genetic analysis of the tolerance traits. A Ph.D. graduate student from Tanzania arrived in January 2013 to work on this project.