Ethylene biosynthesis is involved in the early oxidative challenge induced by moderate Cd exposure in Arabidopsis thaliana

摘要: Abstract The stress hormone ethylene is known to be crucial for the survival of adverse environmental stimuli. Cadmium (Cd), a toxic metal, increases biosynthesis through an upregulated expression 1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) isozymes, ACS2 and ACS6. In this study, wild-type (WT) acs2-1acs6-1 double KO-mutant Arabidopsis thaliana plants were exposed moderate (5 μM) more severe (10 μM) Cd stress. short-term influence Cd-induced production on growth different oxidative parameters, consequent long-term plant acclimation investigated. Short-term conditions elicited enhanced stress-related responses in WT compared mutants. fresh weight mutant leaves was higher after 72 h exposure transcript levels pro-oxidative marker genes as well GSH1 GSH2, enzymes synthesising antioxidative metabolite glutathione (GSH) lower WT. This also resulted GSH content plants. Severe apparently overwhelmed signal sensing system both genotypes, overruling most these responses. Long-term inhibited root leaf development reproductive capacity without inducing differences between suggesting independence. We can conclude that plays important role early challenge induced by A. thaliana.