Venkateswarlu, B. and Maheswari, M. and Saharan, N. (1989) Effects of water deficit on N2(C2H2) fixation in cowpea and groundnut. Plant and Soil, 114 (1). pp. 69-74.
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Abstract
The effect of water deficit on nodulation, N2 fixation, photosynthesis, and total soluble sugars and leghemoglobin in nodules was investigated in cowpea and groundnut. Nitrogenase activity completely ceased in cowpea with a decrease in leaf water potential (psgr leaf) from –0.4 MPa to –0.9 MPa, while in groundnut it continued down to –1.7 MPa. With increasing water stress, the acetylene reduction activity (ARA) declined very sharply in cowpea, but ARA gradually decreased in groundnut. Even with mild water stress (Deltapsgr leaf of 0.2 MPa), nodule fresh weight declined 50% in cowpea partly due to a severe nodule shedding whereas nodule fresh weight declined in groundnut only whenpsgr leaf decreased by 1.0 MPa. No nodule shedding was noticed even at a higher stress level in groundnut. Photosynthesis and stomatal conductance were also more stable in groundnut than in cowpea under water stress. There was a sharp increase in total soluble sugars and leghemoglobin in the nodules of groundut with water stress, but no definite trend could be found in cowpea.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | water stress, nitrogen fixation, nodulation, Vigna unguiculata, Arachis hypogaea |
| Author Affiliation: | CRIDA(Hyderabad) |
| Subjects: | Plant Protection |
| Divisions: | Groundnut Other Crops |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 16 Aug 2012 06:03 |
| Last Modified: | 16 Aug 2012 06:04 |
| Official URL: | http://dx.doi.org/10.1007/BF02203083 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7389 |
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