Chapman, S.C. and Ludlow, M.M. and Blamey, F.P.C. and Fischer, K.S. (1993) Effect of drought during early reproductive development on growth of cultivars of groundnut (Arachis hypogaea L.). I. Utilization of radiation and water during drought. Field Crops Research, 32 (3-4). pp. 193-210.
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Abstract
In a field trial at Redland Bay, Queensland, in 1986/87, cultivars of groundnuts were subjected to a period of reduced soil water supply (RSW) during early reproductive development. During RSW, total biomass production of two Virginia type cultivars (Virginia Bunch and Q18801) was greater than that of a Spanish type cultivar (McCubbin), even though all cultivars used similar amounts of radiation and water. Hence, the radiation use efficiency and transpiration efficiency of Q18801 were significantly greater than those of McCubbin. The radiation use efficiency of the stressed crops was only about 45% of those that were fully irrigated. Throughout RSW, noon leaf water potential was lowest in McCubbin. Under increasing soil water deficit, the leaves of McCubbin tended to wilt, while the Virginia cultivars displayed active leaf folding. Thus, the ratio of the fraction of radiation intercepted by the canopy to LAI was always lower in the Virginia type cultivars. For a given LAI, this phenomenon may have allowed these cultivars to decrease the effective atmospheric demand within the canopy, while maintaining radiation interception at saturation for photosynthesis. The consequence of this, given that the supply of water from the roots did not differ, was that Q18801 was able to maintain a higher LAI and a greater crop transpiration efficiency (ratio of biomass production to transpiration) than McCubbin. The existence of differences among cultivars in transpiration efficiency under drought may prove useful in improving adaptation of groundnut to these environments
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Agriculture, University of Queensland, Brisbane, Qld, Australia |
| Subjects: | Plant Protection > Pests Crop Improvement Crop Improvement > Plant Breeding |
| Divisions: | Groundnut |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 23 Mar 2011 23:04 |
| Last Modified: | 23 Mar 2011 23:04 |
| Official URL: | http://dx.doi.org/10.1016/0378-4290(93)90031-H |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1715 |
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