Submitted to: Biennial Conference on Molecular and Cellular Biology of the Soybean
Publication Type: Proceedings
Publication Acceptance Date: July 29, 1998
Publication Date: N/A
Technical Abstract: Soil waterlogging is a major environmental stress that suppresses soybean growth and productivity. We have identified a putative QTL associated with soybean tolerance to soil waterlogging. One hundred twenty-two recombinant inbred lines (RIL) of the Archer x Minsoy and 86 RIL of the Archer x Noir populations were grown in Columbus, OH at 40 plants per 5-ft row. The plants were subjected to soil waterlogging for two weeks at the R1 stage. Soil waterlogging was imposed by subirrigation to raise the water table to 5 to 10 cm above the soil surface. Supplemental overhead irrigation was used, as needed, to assure uniform flooding. The control plot was not flooded. Plant height and leaf greenness, determined by the SPAD meter, were taken before and right after flooding. At the end of the season, the seeds were harvested and threshed by hand. No QTL was detected for leaf greenness under flooding. One single QTL, the SAT-064 on linkage group U5, ,was associated with 50% of the variation in plant growth under flooded conditions. The same QTL was also associated with more than 50% of the variation in seed yields under flooding. This highly significant QTL (p<0.0001) is uniquely associated with flooding tolerance and is not associated with maturity, resistance to root rot disease or normal seed yields. The fact that it was found in both Archer x Noir and Archer x Minsoy populations demonstrates that it is not dependent on genetic background nor is it a statistical artifact. This QTL will be used in marker aided selection to improve soybean tolerance to soil waterlogging.