In the pot experiment, the effects of a moderate soil drought during the earing-flowering period on CO2 and H2O gas exchange parameters and chlorophyll content in flag leaf and their relations to grain productivity in winter wheat varieties of different drought resistance were studied. The inhibition of photosynthetic activity and a decrease in chlorophyll content under drought were accompanied by a reduction in grain productivity of plants. Strong positive correlations (r = 0,78…0,97) between the content of chlorophyll, the rate of transpiration and photosynthesis and main shoot grain productivity were observed. The results suggest that the changes in photosynthetic traits at a moderate soil water deficit can characterize cultivar drought tolerance and might be used as markers for trait-based selection.
Keywords: Triticum aestivum L., photosynthesis, transpiration, chlorophyll, productivity, physiological markers of drought tolerance
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