Crop Science · 1972 · 33 citations · 0 references
Life SciencesPlant BiologyPlant SciencesPhotosynthesisPlant EcophysiologyPlant PhysiologyCarbon AssimilationCarbon FixationEnvironmental Responses Of PhotosynthesisPlant Environmental PhysiologyPlant Gas ExchangeStomatal PhysiologyAssimilation PhysiologyCarbon DioxideDark AdaptationLight Compensation PointStomatal Response To Elevated Carbon DioxideWater Deficit StressWater Stress Effects On PhotosynthesisWater Stress Physiology
Carbon dioxide exchange was monitored in potted RS 610 sorghum [ Sorghum bicolor (L.) Moench] in a growth chamber as it dried out from a freshly watered condition to severe water stress. Carbon dioxide uptake in the light decreased to near the compensation point at water potentials near ∓25 atmospheres. Leaf resistance to gaseous exchange was high at this point. Evolution of CO 2 in the light occurred as stress became greater. Dark evolution of CO 2 was higher at water potentials near ∓20 atmospheres than in either the more severely stressed or non‐stressed condition. The activity of phosphoenolpyruvic carboxylase remained comparatively high as water stress increased.