alexa The Influence of Vitis riparia Rootstock on Water Relations and Gas Exchange of Vitis vinifera cv. Carignane Scion Under Non-Irrigated Conditions
Biochemistry

Biochemistry

Journal of Plant Biochemistry & Physiology

Author(s): M PadgettJohnson, L E Williams, M A Walker

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A two-year study examining the water relations and gas exchange of Vitis riparia Michaux, Vitis vinifera L. cv. Carignane, and grafted vines comprised of a Carignane scion on V. riparia rootstock was conducted in a non-irrigated vineyard at the University of California Kearney Agricultural Center, near Fresno, California. During the two seasons the data was taken (1992 and 1993), soil water content of the trial plot was similar and decreased during the growing season. Pre-dawn leaf water potential (ψleaf), pre-dawn leaf osmotic potential (ψπ), and stem water potential values (ψstem) did not differ among the treatments. Net carbon dioxide assimilation (A), stomatal conductance (gs), and instantaneous water use efficiency (WUE) were influenced by treatment, and behaved similarly comparing the two years. Carignane vines had significantly greater gas exchange values than either V. riparia or the grafted vines, but the latter two were similar to one another. These results indicate that under non-irrigated conditions, rootstock can modify gas exchange behavior of the scion cultivar even though vine water status was not altered.

This article was published in American Journal of Enology and Viticulture and referenced in Journal of Plant Biochemistry & Physiology

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