Abstract
SummaryFive Coffea arabica cvs, Catuai, Nacional, Maragogipe, Mundo Novo and Angustifolia, were used to evaluate the effect of water stress on the ability of leaves to reduce nitrate and on leaf diffusive resistance to water vapour. In all cultivars there was a significant linear relationship between leaf water potential and nitrate reductase activity. A significant difference in the effect of water stress on the activity of nitrate reductase was only observed between cvs Catuai and Nacional, the former being more tolerant to water deficits in relation to nitrate reduction. There were no significant differences between cultivars in the effect of water deficits on leaf diffusive resistance. The in vivo activity of nitrate reductase indicated that this parameter may be used as a suitable criterion for the evaluation of the effect of water stress on the physiology of coffee plants.
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