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Am. J. Enol. Vitic. 56:1:68-72 (2005)
Copyright © 2005 by the American Society for Enology and Viticulture.
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Research Note

Influence of Water Deficit Stress on Leaf Area Development and Transpiration of Sangiovese Grapevines Grown in Pots

Marco Bindi1, Silvia Bellesi2, Simone Orlandini1, Luca Fibbi3, Marco Moriondo1 and Thomas Sinclair4,*

1 DISAT, University of Florence, P. le delle Cascine 18, 50144, Florence, Italy; 2 CeSIA, Accademia dei Georgofili, Logge Uffizi Corti, 50122, Florence, Italy; 3 IATA, CNR, P. le delle Cascine 18, 50144 Florence, Italy; 4 Agronomy Dept., Agronomy Physiology Lab, University of Florida, Gainesville, FL 32611.

* Corresponding author [Email: trsincl{at}ifas.ufl.edu; tel: 352 392-6180; fax: 352 392-6139]

A stable, conservative variable is needed to describe the level of water-deficit stress to which grapevines are subjected. In agronomic crops, a function based on the amount of transpirable water stored in the soil has been found to provide such stable functions. This initial study examined whether this approach could be used to describe the response of transpiration rate and leaf area development rate in grapevines. The soil in which four-year-old grapevines (Vitis vinifera L. cv. Sangiovese) were growing was allowed to dry over several days. Both transpiration rate, which is assumed to be proportional to the gas exchange capability of the plant, and leaf area development rate did not decrease until the fraction of the transpirable soil water (FTSW) declined to about 0.35. Below 0.35 FTSW there was a continuous decline in each process until they were zero at FTSW = 0. The overall behavior of the plants to the drying soil was well described by logistic equations based on FTSW.

Key words: soil drying, transpiration, leaf area development, water deficit






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Copyright © 2005 by the American Society for Enology and Viticulture.