4 resultados
Water stress induces Crassulacean acid metabolism (CAM)(†) in Portulacaria afra as manifested by day stomatal closure, organic acid fluctuation, and night CO2 uptake. We now have evidence that abscisic acid treatment of leaves causes partial stomatal closure that is accompanied by the induction of
In response to water stress, Portulacaria afra (L.) Jacq. (Portulacaceae) shifts its photosynthetic carbon metabolism from the Calvin-Benson cycle for CO(2) fixation (C(3)) photosynthesis or Crassulacean acid metabolism (CAM)-cycling, during which organic acids fluctuate with a C(3)-type of gas
Portulacaria afra, a succulent plant, shifts from a predominantly C(3) mode of gas exchange to a typical Crassulacean acid metabolism type CO(2) uptake in response to water or NaCl stress. Control plants in the absence of water stress assimilated CO(2) during the light (about 7-8 mg CO(2) dm(-2)
Experiments were performed to test the hypothesis that succulents "shift" their method of photosynthetic metabolism in response to environmental change. Our data showed that there were at least three different responses of succulents to plant water status. When plant water status of Portulacaria