Visn. Hark. nac. agrar. univ., Ser. Biol., 2021, Issue 2 (53), p. 6-22


Yu. E. Kolupaev1, 2, T. O. Yastreb1, M. A. Shkliarevskyi1, Yu. V. Karpets1, A. I. Dyachenko3

1Dokuchaev Kharkiv National Agrarian University
(Kharkiv, Ukraine)
2Karazin Kharkiv National University
(Kharkiv, Ukraine)
3Institute of Cell Biology and Genetic Engineering
of National Academy of Sciences of Ukraine
(Kyiv, Ukraine)

Salicylic acid (SA) is now considered one of the key hormones involved in the regulation of many physiological programs and processes in plants, primarily in adaptation to action of biotic and abiotic stressors. SA is synthesized in plants by phenylpropanoid and isochorismate pathways. The first pathway begins with the conversion of phenylalanine to trans-cinnamic acid, which can be converted into two different metabolites: ortho-coumaric acid, and benzaldehyde. Both metabolites are ultimately converted into SA. In the isochorismate path, the chorismate formed from shikimic acid is isomerized into an isochorismate, the latter being transformed into SA. The effects of SA synthesis pathways activation and its accumulation in plants in response to stressors of different nature are shown: extreme temperatures, dehydration, salinization, heavy metals, etc. Treatment of plants with exogenous SA in optimal concentrations causes an increase in their resistance to abiotic stressors of various natures. Key protective reactions that can be induced by salicylic acid are increased gene expression and activity of antioxidant enzymes, increased content of low-molecular-weight antioxidants, as well as multifunctional protective compounds, in particular proline and sugars. Also under the influence of SA, an activation of synthesis of a number of heat shock proteins, dehydrins, and alternative oxidase was recorded. At the level of a whole plant organism, an important reaction is the induction by SA of a stomata closure. Despite the rich phenomenology of the SA effects, its functional interaction with other signaling mediators and plant stress hormones in the formation of plants’ adaptive responses remains insufficiently studied.

Key words: salicylic acid, plant hormones, signaling mediators, plant resistance, antioxidant system, compatible osmolytes, stress proteins



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