Numerous research groups in the U.S. are studying drought tolerance in soybean. These include labs in Arkansas, Georgia, Missouri, Nebraska, and North Carolina. Researchers at Texas A&M University routinely obtain promising genotypes from these programs. Although these labs have reported using greenhouse studies to screen genotypes for drought during early vegetative growth, there are few studies from greenhouse screening conducted during reproductive growth. The proposed greenhouse research will provide additional data for plants stressed after flowering.

The ultimate goal is to develop a technique that can be used in soybean breeding programs to differentiate breeding lines for drought...