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United States Department of Agriculture

Agricultural Research Service

Title: Wine Grape Response to Foliar Particle Film under Differing Levels of Preveraison Water Stress

Authors
item Shellie, Krista
item Glenn, D Michael

Submitted to: HortScience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 12, 2008
Publication Date: April 1, 2008
Citation: Shellie, K., Glenn, D.M. 2008. Wine grape response to foliar particle film under differing levels of preveraison water stress. HortScience. 43(5):1392-1397.

Interpretive Summary: Deficit irrigation is a production tool used on wine grapes and other perennial fruit crops to manage vegetative and reproductive growth for enhancement of product quality and/or increased water use efficiency. Warm, arid production regions with high solar radiation are particularly well suited for using deficit irrigation as a production tool; however, high ambient temperatures may render the exposed fruit and leaves more susceptible to damage from solar radiation and/or heat, and reduced leaf gas exchange may deleteriously affect productivity or fruit maturity. We investigated how a particle film comprised of kaolin, a white, chemically inert clay, applied to the leaves of grapevines affected the leaf gas exchange, leaf water status, yield and berry maturity of red ('Merlot') and white ('Viognier') wine grape (Vitis vinifera L.) cultivars and evaluated these cultivars under differing levels of water stress over two growing seasons (2005, 2006). The net amount of leaf gas exchange occurring during the day was increased by application of particle film and the effect varied according to vine water status. Particle film delayed the onset of a daily decline in leaf gas exchange when vines were under mild water stress but had no influence on gas exchange when vines were under higher levels of vine water stress. The increased berry weight of 'Merlot' and higher soluble solids concentration of 'Viognier' of fruit from vines with particle film suggests that overall vine carrying capacity may be increased by particle film application. Fruit surface browning was observed on deficit irrigated, particle film treated vines on exposed clusters on the west side of the canopy, indicating that the film did not eliminate development of heat stress symptoms on fruit under the most extreme environmental conditions evaluated in this study.

Technical Abstract: Deficit irrigation is a production tool used on wine grapes and other perennial fruit crops to manage vegetative and reproductive growth for enhancement of product quality and/or increased water use efficiency. Deficit irrigation regimes imposed prior to veraison reduce vine vegetative growth, permitting higher canopy light transmission and may enhance berry components that are associated with quality. Warm, arid production regions with high solar radiation are particularly well suited for using deficit irrigation as a production tool; however, high ambient temperatures may render exposed fruit and leaves more susceptible to damage from solar radiation and/or heat, and reduced leaf gas exchange may deleteriously affect productivity or fruit maturity. We investigated how a foliar application of a particle film comprised of kaolin, a white, nonporous, chemically inert aluminosilicate mineral, affected wine grape stomatal conductance, leaf water potential, yield and berry maturity of red ('Merlot') and white ('Viognier') winegrape (Vitis vinifera L.) cultivars under differing levels of vine water stress over two growing seasons (2005, 2006). Net diurnal stomatal conductance was increased by application of particle film, but only under mild levels of vine water status. Particle film had no direct influence on leaf water potential. The increased berry weight of 'Merlot' and higher soluble solids concentration of 'Viognier' of fruit from vines with particle film suggests that overall vine carrying capacity may be increased by particle film application. Fruit surface browning was observed on deficit irrigated, particle film treated vines on exposed clusters on the west side of the canopy, indicating that the film did not eliminate development of heat stress symptoms on fruit under the most extreme environmental conditions evaluated in this study.

Last Modified: 7/24/2014
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