Abstract
Plants are exposed to water deficits whenever the rate of water loss exceeds that of water absorption. The rate of water loss is determined by the atmospheric evaporative demand and the stomatal control of transpiration while the rate of water absorption depends on both the availability of soil water and the extent of the root system. By definition, cells and tissues are regarded as water-deficient or water-stressed when their water potential falls below zero (Crafts, 1968; Kramer, 1969). Given that the state of full turgor is hardly achieved (for a review, see Karamanos, 1980), plants are usually water-stressed during the greatest part of the day showing the most negative values of their water potential around midday (Namken et al., 1969). Under conditions of high evaporative demand plants are water-stressed to a considerable extent even when soil water is adequate (Denmead, Shaw, 1962). It follows that water stress is particularly intense in plants growing in places of low rainfall and high evaporative demand.
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Karamanos, A.J. (1984). Ways of Detecting Adaptive Responses of Cultivated Plants to Drought. An Agronomic Approach. In: Margaris, N.S., Arianoustou-Faraggitaki, M., Oechel, W.C. (eds) Being alive on land. Tasks for vegetation science, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6578-2_12
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DOI: https://doi.org/10.1007/978-94-009-6578-2_12
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