Water relations and photosynthesis in Cucumis sativus L. leaves under salt stress |
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Authors: | P. Stępień G. Kłbus |
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Affiliation: | (1) Institute of Plant Biology, Department of Plant Physiology, University of Wroclaw, ul. Kanonia 6/8, PL-50328 Wroclaw, Poland |
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Abstract: | Hydroponically grown cucumber plants were exposed to 14-d period of salinity (0, 50, 100 mM NaCl). NaCl caused reduction in the relative water content in the leaves. The Na+ content increased and the K+ content decreased. The net photosynthetic rate, stomatal conductance and transpiration rate were markedly decreased by all of the salt treatments. Salinity decreased also the maximum quantum efficiency of photosystem 2 (PS 2) determined as the variable to maximum fluorescence ratio, the photochemical quantum yield of PS 2 and the photochemical fluorescence quenching, while the non-photochemical quenching increased. Above results indicate that NaCl affects photosynthesis through both stomata closure and non-stomatal factors. |
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Keywords: | chlorophyll fluorescence NaCl net photosynthetic rate stomatal conductance transpiration rate |
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