Abstract
A study was carried out to determine the impact of yield standardization in the dessert grape cultivars Victoria, Palieri, Matilda and Bolgar on their leaf gas exchange parameters. Divergent impact of yield standardization on the leaf gas exchange parameters – transpiration and stomatal conductance was found. For these traits, there were no statistically proven differences between the different variants. There was specificity regarding the impact of the cultivars studied and yield standardization on leaf gas exchange parameters. The highest values of transpiration intensity were observed in Victoria, Palieri and Bolgar, of stomatal conductance – in Victoria and Bolgar. No comprehensive effect of standardization and cultivar on photosynthetic rate and A / gs ratio was demonstrated.
Keywords: dessert grape cultivars, yield standardization, leaf gas exchange parameters, net photosynthetic rate, transpiration intensity, stomatal conductance