Genotypic Variation for Nitrogen Fixation in Soybean |
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| Authors: | E Ramona Garner V T Sapra M Floyd |
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| Institution: | Department of Plant and Soil Science, Alabama A&M University, Normal, AL 35762, U.S.A. |
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| Abstract: | Twenty soybean cultivars from maturity groups IV, V, VI, VII and VIII were screened in the growth chamber study to determine their response to two Rhizobium strains through N-fixation rates. Cultivars Lee 74, Essex and Bay showed high nitrogenase activities of 201.00, 93.75 and 74.86 nM C2H2/pl/hr, respectively. Braxton, Hutton and Bragg showed low nitrogenase activity rates of 4.73, 4.20 and 3.0 nM C2H2/pl/hr, respectively. A range of variation was found among the cultivars in shoot fresh and dry weights, nodule number and nodule weight. |
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| Keywords: | Glycine max acetylene reduction nitrogen fixation rhizobium nitrogenase activity |
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