Abstract

Transpiration and net photosynthesis of eggplant ( Solanum melongena L.) cultivar ‘Claresse’ were measured at decreasing leaf water potential ( ψ leaf). Attached single leaves were used in an open system and 6 levels of irradiance were applied. Mesophyll resistance to diffusion of Co 2 ( r' m) and stomatal resistance to diffusion of water vapour ( r s) were calculated from the gas exchange rates. As ψ leaf declined, transpiration and photosynthesis decreased due to stomatal closure and an increase in r' m in the case of photosynthesis. For the same degree of water stress, photosynthesis was maintained better in egg-plant than in other vegetable plants cited in the literature. Twenty four hours after the severely stressed plants were rewatered, gas exchange rates had not recovered completely. This was due to an after-effect of stress on the stomates, and to additional direct effects of drought on the photosynthetic system.

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