UV-B stress-induced ABA production in Arabidopsis thaliana mutants defective in ethylene signal transduction pathway
2008
Rakitin, V. Yu | Karyagin, V. V | Rakitina, T. Ya | Prudnikova, O. N | Vlasov, P. V
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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