| The effects of water stress on the photosynthetic and stomatal behavior of field-grown tomatoes (Lycopersicum esculentum Mill, cv. UC82B) were investigated. Water stress was imposed by growing plants on stored soil water only. Very little differences in seasonal, diurnal and ontogenic trends were observed in midday field rates of leaf photosynthesis and water potential for both well irrigated and doughted treatments, despite drastic reductions in both canopy development and biomass production. Leaf conductance, however, was generally lower for droughted treatments, probably reflecting adaptations to water stress.;;Tomato stomata closed pronouncedly in response to increases in evaporative demand, consistent with constancy of ;;A/C... |
