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Identification of Soybean Genotypes with N₂ Fixation Tolerance to Water Deficits

^a USDA-ARS, Agronomy Physiology Laboratory, P.O. Box 110965, Univ. of Florida, Gainesville, FL 32611-0965 USA
^b Agronomy Dep., Univ. of Arkansas, Fayetteville, AR 72703 USA
^c Agronomy Physiology Laboratory, P.O. Box 110965, Univ. of Florida, Gainesville, FL 32611-0965 USA
^d Faculté des Sciences, BP S 15 Marrakech, Morocco
^e USDA-ARS, Soybean/Maize Germplasm, Pathology and Genetics Research Unit, Dep. of Crop Science, Univ. of Illinois, 1101 W. Peabody Dr., Urbana, IL 61801 USA

View larger version (40K): [in a new window]   Fig. 1 (A) Plot of distribution of petiole ureide among plant introduction lines of soybean in the Stage 1 screen at Stoneville, MS, in 1995. (B) The petiole ureide data are plotted as natural logarithm transformation

View larger version (24K): [in a new window]   Fig. 2 Plot of distribution of tolerance ratio among plant introductions of soybean in the Stage 2 screen at Gainesville, FL, in 1996, 1997, and 1998

View larger version (21K): [in a new window]   Fig. 3 Plot of normalized acetylene reduction activity (NARA) and of normalized transpiration rate (NTR) against the fraction transpirable soil water (FTSW) for soybean line PI578315B as part of the Stage 3 screen