Plant Physiol. Drug Metab Dispos
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Plant Physiology 98:908-912 (1992)
© 1992 American Society of Plant Biologists

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Environmental and Stress Physiology

Bound Water in Durum Wheat under Drought Stress 1

Agata Rascio, Cristiano Platani, Natale Di Fonzo and Giovanni Wittmer

Istituto Sperimentale per la Cerealicoltura, S.S. 16 Km. 675, 71100 Foggia, Italy

To study drought stress effects on bound water, adsorption isotherms and pressure-volume curves were constructed for two durum wheat (Triticum durum Desf.) cultivars: Capeiti 8 (drought tolerant) and Creso (drought sensitive). Plants were grown under well-watered and water-stressed conditions in a controlled environment. Differential enthalpy ({Delta}H) was calculated through van't Hoff analysis of adsorption isotherms at 5 and 20°C, which allowed us to determine the strength of water binding. {Delta}H reached the most negative values at approximately 0.06 gram H2O/gram dry weight and then increased rapidly for well-watered plants (until 0.10 gram H2O/gram dry weight) or more slowly for drought-stressed plants (until 0.15-0.20 gram H2O/gram dry weight). Bound water values from pressure-volume curves were greater for water-stressed (0.17 gram H2O/gram dry weight) than for well-watered plants (0.09 gram H2O/gram dry weight). They may be estimates of leaf moisture content where {Delta}H reaches the less negative values and hence some free water appears. With respect to the well-watered plants, tightly bound water tended to be less bound during drought, and more free water was observed in cv Creso compared to cv Capeiti 8 at moisture contents >0.10 gram H2O/gram dry weight.

1 This paper is dedicated to the memory of Prof. G. Wittmer, director of the Experimental Institute for Cereal Research, Section of Foggia, who died in the summer of 1990.




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Copyright © 1992 by the American Society of Plant Biologists