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- Title
Alterations in the Components of Peanut Leaf Water Potential during Desiccation1.
- Authors
BENNETT, J. M.; BOOTE, K. J.; HAMMOND, L. C.
- Abstract
Changes in components of leaf water potential during soil water deficits influence many physiological processes. Research results focusing on these changes during desiccation of peanut ( L.) leaves are apparently not available. The present study was conducted to examine the relationships of leaf water ψ, solute ψ and turgor ψ potentials, and percent relative water content (RWC) of peanut leaves during desiccation of detached leaves and also during naturally occurring soil moisture deficits in the field. The relationship of ψ to ψ and RWC was evaluated by calculating ψ from differences in ψ and ψ determined by thermocouple psychrometry and by constructing pressure-volume (P-V) curves from the ψ and RWC measurements. Turgor potentials of ‘Early Bunch’ and ‘Florunner’ leaves decreased to zero at ψ of −1.2 to −1.3 MPa and RWC of 87%. There were no cultivar differences in the ψ at which ψ became zero. P-V curves indicated that the error of measuring ψ after freezing due to dilution of the cellular constituents was small but resulted in artefactual negative ψ values. Random measurements on two dates of ψ, ψ, and calculation of ψ from well-watered and water-stressed field plots consisting of several genotypes indicated that zero ψ occurred at ψ of −1.6 MPa. It was concluded that the relationships of ψ, ψ, ψ, and RWC of peanut leaves were similar to leaves of other crops and that these relationships conferred no unique drought resistance mechanism to peanut.
- Publication
Journal of Experimental Botany, 1981, Vol 32, Issue 5, p1035
- ISSN
0022-0957
- Publication type
Article