Physiological state of mandarin plants under the influence of exogenous plant growth regulators

The purpose of the study is to study the effectiveness of the use of new generation growth regulators on mandarin plants to improve productivity, product quality and crop resistance to environmental factors, followed by the development of sound recommendations for their effective use. The task of a particular stage is connected with the study of the possibility of increasing the adaptive potential of the dwarf mandarin against the background of the use of biologically active substances of a new generation. In this paper show that the influence of growth regulators obstaktin (concentration of 0.05%). Field research has been conducted since 2017 in the experimental and technological Department of the fruit crops sector of the all-Russian Institute of floriculture and subtropical crops (Sochi, Russia) on the plantation of dwarf mandarin (Citrus reticulata var. unshiu Tan.) cultivars of Miyagawa-Vase, laboratory tests performed in the laboratory of physiology and biochemistry of plants. Studies have shown that the leaf area of mandarin plants during treatment with obstaktin significantly exceeded the control variant (LSD (P≤0.05) = 2.82). The effect of obstaktin was expressed in a more active assimilation activity of the leaf apparatus, which contributed to a greater accumulation of dry matter. The productivity of the leaves of dwarf mandarin was calculated and it was revealed that the highest values were noted on the variant with obstaktin treatment (10.12 g / dm2 at 8.62 g/dm2 on the control). Obstaktin contributes to a significant increase in the number of green photosynthetic pigments (up to 2.29 mg / g raw weight) and a significant increase in the synthesis of carotenoids (0.44 mg / g raw weight), which activates the protective mechanisms of plants (LSD (P≤0.05) = 0.08). At the same time, their viability increases (Fm/F_T = 2,478 units), which explains the active assimilation processes. Thus, it is possible to speak about positive influence of growth regulators on a physiological condition of plants of a dwarf mandarin, both in the optimum period, and at approach of stressful hydrothermal conditions.

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