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Salinity and Photochemical Efficiency of Wheat

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Author(s): Mohammad Reza Amirjani

Journal: International Journal of Botany
ISSN 1811-9700

Volume: 6;
Issue: 3;
Start page: 273;
Date: 2010;
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Keywords: Chlorophyll | Fv/Fm | Electron transport rate | salt stress | Triticum aestivum

ABSTRACT
The aim of the present study was to understand the effect light intensity on the fluorescence parameters of PSII (Fv/Fm) and the linear photosynthetic Electron Transport Rate (ETR) of leaf sections exposed to high salt stress. Estimation of Chl a concentration and accumulation during greening of dark-grown leaf sections within different salt gradients been used as a tool to support the Chl fluorescence parameters in light adapted plants entailment to Chl accumulation. Since the Chlorophyll (Chl) content is index of the photosynthetic fluorescence parameters in plants, the accumulation of Chl 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 Chl fluorescence found to be species-dependent and also specific to plant growth conditions. The Fv/Fm ratio has decreased in leaf sections after incubation for 2 h in 600 mM under light intensity of 40 ╬╝mol/m2/sec.
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