The analysis of correlations between the photosynthetic traits of the flag leaf and components of the grain productivity of plants of high-yielding modern variety Favorytka and variety of earlier selection Myronivska 808 at different level of mineral nutrition was conducted. It was found that the CO2 assimilation rate and transpiration rate at anthesis and the phase of milky-wax ripeness closely positively correlated with the mass of grain, grain number and weight of 1000 grains of main shoot spike. The correlation of chlorophyll and Rubisco contents with the grain productivity was stronger at the phase of milky-wax ripeness that resulted from weak coupling these indices with the mass of 1000 grains at anthesis but their close correlations with the both components of spike productivity at the later stages of reproductive period. The effects of negative relationship between the number of grains per spike and weight of 1000 grains on the expression of links between photosynthetic traits and productivity in winter wheat plants are discussed.
Keywords: Triticum aestivum L., photosynthesis, transpiration, chlorophyll, Rubisco, productivity, grain number, grain weight
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