Photosynthetic Characteristics and Environmental Control in Some Grapevine Cultivars

Abstract

The ecophysiological characterization of the net assimilation of CO₂ is an important approach to the optimization of all forms of productivity in grapevine (primary production and crop yield) and quality. It must also be taken into account that the criteria for defining photosynthetic efficiency depends on the particular environment under analysis and that external conditions highly favorable for photosynthesis do not necessarily increase fruit production (Kriedemann, 1977). Some basic physiological data on these topics have already been obtained in Australia [Kriedemann et al 1968, 1971 and Smart, 1974), California (Kliewer et al 1970) and USRR (Stoev et al 1966). More recently Carbonneau et al (1978, 1979) have used bioclimatic and physiological information of grapevine in agronomic experiments. New training systems which conciliate wine quality and yield have been sucessfully tried in the Bordeaux region.