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    Biochemical composition of dwarf mandarin cv. ‘Miagava-Vase’ in the humid subtropics of Russia
    (2023-01-01)
    Kunina, V.
    ;
    Soytong, K.
    ;
    Song, J. J.
    ;
    Belous, O.
    The influence of growth regulators and biochemical composition of dwarf mandarin fruits was investigsated. It is shown that heavier fruits (44.8-48.2 g at 41.3 g in the control) are formed during treatment with siliplant, nanoelicitor and zerbra agro due to the formation of a thicker peel (20.1-20.9%), which is associated with the protective mechanism of these drugs which thicker peel is a mechanical protection against pathogens and phytoparasites. Siliplatin treatments provided a higher juice output about 54.5% compared to other growth regulators. Treatments with obstactin and silver agro significantly increased the fructose content in fruits (17.53-16.98 g / kg). The nanoelicitor variant has significantly higher sugar content (107.49 g /kg) due to the content is increased (73.12 g/kg). The use of growth regulators leaded to decrease in ascorbic acid (AA) to 30.61 mg / 100 g, which was shown to be an undesirable factor. The most significantly decreased in ascorbic acid (LSD = 8.27) was noted in variants with obstactin and siliplant treatments. Taking into account, the influence of growth regulators on plant resistance are increased AA synthesis under stress and decreased in ascorbic acid is associated with an improvement in the functional state of tangerine under the influence of non-root treatments. With the introduction of growth regulators, there was significantly increased in the amount of polyphenols (up to 9.33 mg /g at 7.72 mg /g in the control), especially on variants with treatments with obstactin (7.53 mg /g), siliplant (7.39 mg /g) and zerebra agro (7.33 mg/g). Treatments with growth regulators leaded to a significant increase in the Rutin in mandarin fruits (from 7.39 to 7.58 mg /g). The highest values of vitamin P were noted in the variant with obstactin and nanoelicitor treatment (7.53-7.58 mg/g at 6.68 mg/g). Nanoelicitor treatments accelerated fruit ripening, which represented to consumer value and economic benefits of growing crops for the resort town/area.
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    Influence of exogenous growth-regulators on physiological and growth processes of dwarf mandarin cv. ‘Miagava-Vase’
    (2021-09-01)
    Belous, O.
    ;
    Soytong, K.
    ;
    Vasileyko, M.
    The influence of biologically active substances of a new generation as growth regulators on the process of ovary fall, improving the quality of fruits and increasing the adaptive potential of tangerine was investigated. The tested citrus plants are dwarf mandarin cv. ‘Miagava-Vase’. The tested plants have grown since in 1986 at Plantation of Subtropical Scientific Centre, Sochi, Russia. The experimental scheme clarified the three options as exogenous growth-regulators: obstaktin (5 ml/l water); nanoelicitor (1 ml/l water) and siliplant (5 ml/l water). The content of chlorophyll and carotenoids are determined; the assessment of the functional state of plants was carried out on the slow induction of chlorophyll fluorescence. It was found that the treatment of plants with growth regulators did not affect the content of green pigments in the leaves. In the processing microbial nanoelicitor and siliplant increased the number of carotenoids, thereby enhancing the defense reactions. Treatment with growth regulators led to an improvement in the functional state of plants, which was expressed in a higher value of the viability index, especially on variants with the introduction of nanoelicitor and siliplant. The treated citrus plants with siliplant resulted to the highest number of carotenoids increased in the leaves and followed by nanoelicitor. They imply as the activation of protective reactions to the plants. The slow chlorophyll fluorescence inductiuon expressed the higher viability index in siliplant than nanoelicitor and obstaktin. The photosynthetic activity index revealed that nanoelicitor and siliplant gave the highest activity and followed by obstaktin. The coefficient of photosynthetic activity expressed that nanoelicitor, siliplant and obstaktin were significantly higher than the control. Nanoelicitor showed significantly highest plant growth and followed by siliplant and obstaktin. Siliplant treatment confirmed significantly highest mass of fruits and followed by nanoelicitor and obstaktin. The fruits diameter was higher in siliplant than obstaktin and nanoelicitor. The treated citrus leaves with nanoelicitor encountered scoparone, a phytoalexin associated with resistance of Citrus to root rot.