SUMMARY. To elucidate a possible role of jasmonate signaling in stomata regulation under salt stress, we studied the effects of treatment with sodium chloride (50–200 mM) and/or methyl jasmonate (200 μM) of leaves of wild-type Arabidopsis thaliana L. plants and jasmonate sig-naling mutants. A 2–3 hour exposure to NaCl induced stomata closure in wild-type plants (Col-0). The most noticeable effect was observed under the influence of 100 mM sodium chloride. At the same time, NaCl treatment of the leaves of jin1 mutant, defective in gene encoding transcription factor JIN1/MYC2, practically did not affect the stomata state. In plants of the coi1 genotype, mutants in gene encoding COI1 protein, involved in removal of repressors of jasmonate signaling transcription factors, only a slight decrease in stomatal aperture occurred under the influence of salt. A 3-hour leaf treatment with 200 μM methyl jasmonate caused a marked stomata closure in wild-type plants, but not in jin1 and coi1 mutants. With the combined effect of methyl jasmonate and salt on the leaves of Arabidopsis of three genotypes, the tendency to additional decrease in stomatal aperture was manifested only in wild-type plants. A conclusion is drawn on the role of jasmonate and its signal transduction system in the regulation of stomatal movements during salt stress.
Keywords: Arabidopsis thaliana, stomata, salt stress, jasmonate signaling, methyl jasmonate
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