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We studied the influence of ethylene product Esphon® and triazole derivative Folicur® on the morphogenesis and productivity of tomatoes. The obtained results explained the significant role of morphological and mesostructural components of “source-sink” relation system of tomatoes in the formation of crop productivity. We established that the Folicur application resulted in more significant anatomical and morphological changes in the formation of leaf apparatus in comparison with the ethylene producer: the measurement of number, weight, area of leaf surface, and leaf index were higher in this variant of experiment. We also noted the appropriate changes in the mesostructure measurement of leaves: thickness of leave – main photosynthetic tissue of chlorenchyma, assimilatory cells size of palisade and spongy parenchyma. Analysis of depositing possibilities of plants vegetative organs at the fruitification stage indicates the importance of temporary postponement of nonstructural carbohydrates and nitrogen containing compounds in them followed by reutilization for carpogenesis needs. Application of Folicur resulted on the formation of a more powerful donor sphere and in the early fruit growth and formation stages are postponed more carbohydrates in vegetative organs of tomato plants compared to control. The content of sugars and starch in the roots, stems and leaves of plants under Folicur treatment was highest in all organs of the plant throughout the fruitification phase compared to control and variant with Esphon application. Our results also testify to the possibilities of nitrogen compounds remobilize from vegetative organs to carpogenesis needs. After Folicur treatment, the most intense decrease in the content of nitrogen containing compounds was observed during the transition from the fruit formation stage to green fruits stage in roots and stem of plant during the period of the most intense tomatoes growth. We concluded that a significant increase the yield of tomato crop was caused by the more powerful donor sphere formation and reutilization of assimilates and nitrogen containing compounds after Folicur application.

Features of morphogenesis, accumulation and redistribution of assimilate and nitrogen containing compounds in tomatoes under retardants treatment