Serraj, R. and Sinclair, T.R. (1998) Soybean cultivar variability for nodule formation and growth under drought. Plant and Soil , 202 (1). pp. 159-166.
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Abstract
Both nodulation and nitrogen fixation in soybean [Glycine max (L.) Merr.] are sensitive to soil drying, which can have important negative effects on yield. An exception to this general response has been the identification of the cultivar Jackson as being drought tolerant for N2 fixation. The objectives of this research were to examine nodule formation and growth in Jackson among other soybean cultivars in response to soil drying under field conditions. Two field experiments were conducted to examine the genetic variation in the sensitivity of nodule numbers and dry weights to soil drying. Substantial variation among soybean lines was found, and the drought-tolerance trait was demonstrated again in Jackson. Greenhouse experiments were conducted to further analyze the variation of nodulation response to soil water content. The differences among cultivars observed in the field were confirmed in the greenhouse. Importantly, the relative drought insensitivity of N2 fixation in cultivar Jackson was associated with high individual nodule dry weight under drought conditions, relative to well-watered plants. It was concluded that large variation in nodulation sensitivity to water deficit exists among soybean cultivars and that the response of N2 fixation rates to drought is related in part to nodule formation and growth.
| Item Type: | Article |
|---|---|
| Additional Information: | This research was supported in part by a grant from the United Soybean Board, Project No.6010P. We gratefully acknowledge the contributions of Andrew K Schreffler, Laura Chifflett, George M Drake, Dr Larry C Purcell, and Dr Jeffery D Ray to this research. |
| Uncontrolled Keywords: | Drought stress, Genetic variation, Glycine max, Nodulation |
| Author Affiliation: | USDA-ARS, Agronomy Department, Agronomy Physiology Laboratory, University of Florida, USA |
| Subjects: | Plant Production Plant Physiology and Biochemistry > Plant Physiology |
| Divisions: | Soyabean |
| Depositing User: | Mr Arbind Seth |
| Date Deposited: | 18 Aug 2013 13:05 |
| Last Modified: | 18 Aug 2013 13:05 |
| Official URL: | http://dx.doi.org/10.1023/A:1004300819535 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/11436 |
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