Salinity and Photochemical Efficiency of Wheat

摘要

The aim of the present study was to understand the effect light intensity on the fluorescence parameters of PSJI (E/F J and the linear photosynthetic Electron Transport Rate (ETR) of leaf sections exposed to high salt stress. Estimation of Chi a concentration and accumulation during greening of dark-grown leaf sections within different salt gradients been used as a tool to support the Chi fluorescence parameters in light adapted plants entailment to Chi accumulation. Since the Chlorophyll (Chi) content is index of the photosynthetic fluorescence parameters in plants, the accumulation of Chi a was investigated in dark-adapted leaf. In this research, the impact of salt concentration and light intensity on photosynthetic fluorescence parameters was studied. Added to that, the regulation occurred in the parameters value was mainly species-dependent but also was perturbed according to the growth conditions. A marked increase in the ETR value was obtained following the short recovery of 1 h. Salt concentration in combination with the light intensity affected the photosynthetic parameters. In addition, the change in Chi fluorescence found to be species-dependent and also specific to plant growth conditions. The E/Fm ratio has decreased in leaf sections after incubation for 2 h in 600 mM under light intensity of 40 umol/mVsec.