Abstract
Porometer measurements were conducted on eggplant, cucumber, sweet pepper and tomato in a glasshouse during day and night conditions at different levels of air vapour pressure deficit. The response of leaf conductance was described as an empirical non-linear function of vapour pressure deficit at leaf surface ( D 0 ) and solar radiation. Leaf conductance at night clearly responded to D 0 . Highest conductance was observed with tomato and cucumber. It is argued that effects of humidity on cuticular conductance may contribute to the increased leaf conductance at low D 0 but also that stomata respond to D 0 at night. If both day and night measurements are combined into one model, the relative response of leaf conductance to vapour pressure deficits is equal for the four species.
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