The effect of photosynthetic chlorophyll pigment in the conditions of various moisture supply on winter bread wheat productivity

Relevance. The current paper has presented the study results of the reaction of winter bread wheat genotypes to the hydrothermal conditions of cultivation according to the parameters of the structural and functional arrangement of flag leaf pigment complexes. The purpose of the study was to identify differences in the reaction of winter bread wheat genotypes to hydrothermal conditions of cultivation according to the parameters of the structural and functional arrangement of flag leaf pigment complexes. To develop a criteria system for assessing drought tolerance, it is important to study the quantitative change in the chlorophyll pigment of winter bread wheat varieties.

Material and methods. The objects of the study were 12 varieties and lines of winter bread wheat developed by the FSBSI “Agricultural Research Center “Donskoy”. The estimation of the state of the pigment complex of flag leaves was conducted during the period of winter bread wheat flowering. The content of chlorophyll pigment was determined by I.G. Shmatko’s method (1976). The varieties’ testing on drought tolerance in the conditions of model drought (zasushnik) was carried out by V.V. Maimistov’s method (1988).

Results. The study of the reaction of the pigment complex of winter bread wheat samples to various moisture degrees allowed identifying genotypes with high adaptability in stressful conditions. Large productivity of the varieties, content of chlorophyll pigment a and the sum of chlorophyll a + b under conditions of insufficient moisture supply were identified in the samples ‘Zodiak’, ‘586/13’, ‘595/13’, ‘Asket’, whose indicators were 182.4 g/m2, 179.1 g/m2, 173.7 g/m², 168.6 g/m²; 2.49, 2.27, 2.35, 2.22 mg/100 g of wet weight; 2.80, 2.83, 2.87, 2.70 mg/100 g of wet weight, respectively.

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