Abstract

The JIN1/MYC2 transcription factor, which is currently considered to be the key in jasmonate signaling, is also involved in the transduction of abscisic acid signals and, probably, in the effects of other intermediaries involved in the formation of plants’ adaptive responses. Arabidopsisjin1 mutants were used to study its possible involvement in protective effects of hydrogen sulfide (H₂S) against salt stress. The treatment of wild-type Arabidopsis plants (Col-0) with the donor of hydrogen sulfide (50 μmol NaHS) led to an increase in their salt resistance, which was expressed in a decrease in oxidative damages, a decrease in water deficit, and preservation of a pool of photosynthetic pigments under 150 mmol NaCl. The treatment of Col-0 plants with NaHS prevented the stress-induced decrease in the activity of antioxidant enzymes, i.e., superoxide dismutase and catalase, and contributed to the increase in the activity of guaiacol peroxidase. In addition, leaves’ proline content in wild-type plants treated with the H₂S donor was lower and sugar was higher after salt stress than in untreated plants. The treatment of jin1 mutants did not contribute to their salt resistance and did not have a noticeable effect on the functioning of the studied protective systems. The obtained results make it possible to assume the involvement of the JIN1/MYC2 transcription factor in the effects of hydrogen sulfide and/or intermediaries of its signaling pathways involved in the formation of plants’ adaptive responses to salt stress.

中文翻译：

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JIN1 / MYC2转录因子参与外源硫化氢诱导拟南芥植物的抗盐性

摘要

JIN1 / MYC2转录因子，目前被认为是茉莉酸信号传导的关键，也参与脱落酸信号的转导，并可能参与植物适应性反应形成过程中涉及的其他中间产物的作用。拟南芥jin1突变体被用来研究其可能参与硫化氢（H ₂ S）对盐胁迫的保护作用。野生型拟南芥的治疗硫化氢（50μmolNaHS）供体的植物（Col-0）导致其耐盐性增强，这表现为氧化损伤的减少，水分缺乏的减少以及光合色素池的保存在150 mmol NaCl中。用NaHS处理Col-0植物可防止应激诱导的抗氧化酶（超氧化物歧化酶和过氧化氢酶）活性降低，并有助于愈创木酚过氧化物酶活性的提高。此外，盐胁迫后，H ₂ S供体处理的野生型植物的叶片脯氨酸含量比未处理的植物低，糖含量更高。jin1的治疗突变体对它们的耐盐性没有贡献，并且对所研究的保护系统的功能没有明显的影响。获得的结果使得有可能假设JIN1 / MYC2转录因子参与硫化氢的作用和/或其信号传导途径的中介物，参与植物对盐胁迫的适应性反应的形成。