RT Journal Article SR Electronic T1 Effect of Temperature on Key Physiological Responses of Grapevine Leaf JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 375 OP 379 DO 10.5344/ajev.1995.46.3.375 VO 46 IS 3 A1 F. Ferrini A1 G. B. Mattii A1 F. P. Nicese YR 1995 UL http://www.ajevonline.org/content/46/3/375.abstract AB The effects of temperature on the physiological responses of self-rooted cv. Trebbiano grapevines in three growth chambers were studied at 20°C, 27.5°C, and 35°C and compared to those of control plants grown in open air. The parameters recorded were photosynthesis, transpiration, stomatal conductance monitored with an LCA 2 (ADC) infrared-gas analyzer, vine development, and leaf growth and chlorophyll content. The lowest net photosynthesis values were recorded in vines grown at 35°C and were closely correlated to chlorophyll content, the latter expressed per unit of leaf area; the effect of temperature on stomatal conductance was less marked. The accumulation of dry matter was correlated to average photosynthesis. The findings suggest that photosynthesis in plants grown at 35°C depends not on stomatal opening but on biochemical factors of an enzymatic nature.