Abstract
Hsiao, T. C. and Acevedo, E., 1974. Plant responses to water deficits, water-use efficiency, and drought resistance. Agric. Meteorol., 14: 59–84. This paper reviews some of the more recent findings on metabolic and physiological aspects of plant—water relations within the context of the topic of this symposium. Examined first are some of the physiological bases for differences among species in wateruse efficiency and drought resistance, with special attention given to CO 2 assimilation and transpiration. This is followed by a summary of important known plant responses to water deficits, mainly at the cellular level, and with some emphasis placed on growth as affected by changes in turgor pressure. Possible physicochemical mechanisms underlying these responses are also briefly discussed. The final section speculates on what several of these responses to water deficits may mean in terms of yield for some simple cases. Aspects considered include leaf area development, dry matter accumulation, and the growth of roots relative to that of leaves.
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