UV-B stress-induced ABA production in Arabidopsis thaliana mutants defective in ethylene signal transduction pathway |
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Authors: | V. Yu. Rakitin V. V. Karyagin T. Ya. Rakitina O. N. Prudnikova P. V. Vlasov |
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Affiliation: | (1) Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya ul. 35, Moscow, 127276, Russia |
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Abstract: | In this study, we examined the influence of UV-B radiation (280–320 nm) on ABA accumulation in 14-day-old Arabidopsis thaliana (L.) Heynh plants of wild type (WT), ethylene receptor mutant (etr1-1), and mutant with a constitutively active ethylene signal transduction pathway (ctr1-1). ABA content in nonirradiated WT plants was twice higher than in each mutant. UV-B irradiation caused dose-dependent ABA accumulation in WT plants. In the etr1-1 mutant, the amount of accumulated ABA was significantly less. In the ctr1-1 mutant, ABA content didn’t increase after UV-B irradiation. These data suggest that start of stress-induced ABA formation requires the adjustable ethylene signal pathway. In the ctr1-1 mutant, a constitutively active (nonadjustable) ethylene signal pathway blocks stress-induced ABA accumulation. |
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Keywords: | Arabidopsis thaliana etr1-1 ctr1-1 UV-B ABA |
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