Visn. Hark. nac. agrar. univ., Ser. Biol., 2019, Issue 2 (47), pp. 61-70


Т. О. Yastreb1, O. I. Horielova1, K. M. Havva1, Yu. Е. Kolupaev1, 2, A. I. Dyachenko3, O. P. Dmitriev3

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

Hydrogen sulfide (H2S) is currently regarded as a signal gasotransmitter molecule involved in many functions of plant organism, including adaptation to stress factors. However, the spectrum of possible adaptive reactions associated with salt resistance and induced by the H2S action has not been sufficiently investigated. Hydrogen sulfide has functional bonds with stress phytohormones, in particular with salicylic acid. At the same time, the possible role of salicylic acid in the realization of physiological (stress-protective) effects of H2S remained unexplored. We studied the effect of sodium hydrosulfide (NaHS), the hydrogen sulfide donor, on the antioxidant and osmoprotective systems, and salt resistance of Arabidopsis thaliana L. wild-type (Col-0) and salicylate-deficient NahG plants, transformed with the bacterial salicylate hydroxylase gene. It was found that transformants differed from wild-type plants by increased activity of antioxidant enzymes and high sugar content under salt stress conditions (150 mM NaCl). In both wild-type and NahG transformants treated with hydrogen sulfide donor by adding 50 μM NaHS to the nutrient medium, under salt stress it was retained high activity of superoxide dismutase and catalase, increased guaiacol peroxidase activity and sugar content, and maintained a pool of photosynthetic pigments in the leaves. Plants of both genotypes treated with the H2S donor, under stress conditions, differed in their lower content of proline and the product of lipid peroxidation malonic dialdehyde in the leaves. It was concluded that the exogenous hydrogen sulfide induction of protective systems involved in the development of salt resistance in Arabidopsis plants can occur without the participation of salicylic acid.

Key words: Arabidopsis thaliana, transformants NahG, salt stress, hydrogen sulfide, antioxidant enzymes, osmolytes



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