Wednesday, November 7, 2007
278-4

Diversity in Tolerance of Soybean (Glycine max L. Merr.) Germplasm to Soil Waterlogging.

Tara VanToai1, Tran Thi Cuc Hoa2, Nguyen Thi Ngoc Hue2, Henry Nguyen3, J. Grover Shannon4, and Bert Bishop5. (1) Soil Drain. Res. Unit, USDA/ARS, 590 Woody Hayes Dr., Columbus, OH 43210, (2) Cuu Long Rice Research Institute, Omon, Cantho, Vietnam, (3) University of Missouri, National Center for Soybean Biotech, 40 Agriculture Bldg. Univ. Mo, Columbia, MO 65211-7140, (4) University of Missouri-Delta Center, 147 State Highway T, P O Box 160, Portageville, MO 63873, (5) OSU-OARDC, 1680 Madison Ave, Wooster, OH 44691-4096

Soybean (Glycine max L. Merr.) cultivars from the U.S. are generally intolerant to flooding stress. Soybean germplasm and cultivars originating from other countries potentially could have better flooding tolerance. Screen house and field tests were conducted to determine differences in waterlogging tolerance of 23 soybean genotypes from Southeast Asia. Waterlogging for 2 weeks at the R2 stage reduced seed yield under field conditions between 37 and 100% (all plants dead). However, plants that survived flooding averaged 29% taller than control plants.  Three genotypes, VND2, Nam Vang and ATF15-1 had the best R2 waterlogging tolerance indexes (R2WLTI).  Of these, Nam Vang, a landrace from Cambodia, was also tolerant to waterlogging at V4 stage. This line provides a new germplasm resource for the genetic improvement of waterlogging tolerance in soybean. Tolerance to R2 waterlogging was associated with higher number of pods per plant and more seeds per pod, while tolerance to V4 waterlogging was associated with larger seed size.  Growth response to waterlogging stress, as determined by plant height, was correlated between the field and screen house. The screen house test could distinguish tolerant from susceptible genotypes based on plant survival and tolerance index.

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