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DETERMINATION OF SENSITIVE SITES IN PHOTOSYNTHESIS DURING LONGTERM PLANT DEHYDRATION

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Author(s): M BRESTIČ

Journal: Journal of Central European Agriculture
ISSN 1332-9049

Volume: 2;
Issue: 3;
Start page: 217;
Date: 2002;
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Keywords: photosynthesis | water stress | stomatal and non-stomatal effects

ABSTRACT
The aim of this work was to measure the net CO2 assimilation, O2 evolution, Rubisco activity, 13C content, actual photochemical PSII efficiency, stomatal conductance, water and osmotic potentials as well as relative water content during increasing plant dehydration. The measurements allowed to determine vulnerability of individual segments of complex process of photosynthesis and characterise the stomatal and non-stomatal responses to dehydration and resistance of mechanisms of photosynthesis to gradual water stress. The sensitiveness of stomata, osmoprotection and isotopic 13C discrimination seem to be the most interesting parameters which act dynamically in plant acclimation to drought. They may be successfully used in screening new genotypes with efficient water and carbon use and in quantification of threshold of deleterious environmental effect to photosynthesis.
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