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Am. J. Enol. Vitic. 50:1:76-80 (1999)
Copyright © 1999 by the American Society for Enology and Viticulture.
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Osmotic Adjustment and Partitioning of Turgor Responses to Drought in Grapevines Leaves

A. Patakas 1 and B. Noitsakis 2

1 Laboratory of Viticulture, Aristotle University of Thessaloniki, P.O. Box 236, Thessaloniki - 54006, Greece
2 Dept. of Range and Wildlife Sciences, Aristotle University of Thessaloniki, P.O. Box 236, Thessaloniki - 54006, Greece.

noits{at}for.auth.gr

The aim of this study was to examine the ability of grapevines (V. vinifera L.) for osmotic adjustment using the pressure-volume technique as well as to evaluate the relative contribution of changes in both osmotic and elastic properties of leaf tissue in turgor maintenance under drought conditions. Pressure volume analysis indicated a significant increase in symplastic water fraction of the total water content in stressed plants. The calculated decrease in osmotic potential due to net solute accumulation in stressed grapevines was 0.55 MPa, suggesting that osmotic adjustment constitutes an important drought tolerance mechanism. Partitioning of turgor responses to drought into its components, revealed a negative contribution of elastic adjustment in turgor maintenance of stressed grapevines. Thus, the physiological role of tissue elasticity as a beneficial drought mechanism in grapevines might be reconsidered.

Key words: elastic adjustment, osmotic adjustment, Vitis vinifera, water stress

Submitted on February 18, 1998
Revised on May 15, 1998






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Copyright © 1999 by the American Society for Enology and Viticulture.