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A wheat aminocyclopropane-1-carboxylate oxidase gene, TaACO1, negatively regulates salinity stress in Arabidopsis thaliana.

Plant Cell Rep.2014 Nov;33(11):1815-27. doi:10.1007/s00299-014-1659-7. Epub 2014 Jul 22
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摘要


KEY could catalyze ACC into ethylene in vitro. Constitutive expression of TaACO1 in Arabidopsis conferred salt sensitivity, and TaACO1 regulates salt stress mainly via the DREB1/CBF signal transduction pathway. Ethylene signaling plays essential roles in mediating plant responses to biotic and abiotic stresses, besides regulating plant growth and development. The roles of ethylene biosynthesis in abiotic stress, however, remain elusive. In this study, an aminocyclopropane-1-carboxylate oxidase gene, TaACO1, affecting the terminal step in ethylene biosynthesis, was isolated from a salt-tolerant bread wheat introgression line Shanrong No. 3 (SR3) and its effect on salt-stress response was examined. Purified recombinant protein of TaACO1 heterogenously expressed in Escherchia coli could catalyze ACC into ethylene in vitro. TaACO1 transcripts were down-regulated by salt, drought, oxidative stress and ABA. TaACO1-transgenic plants conferred salt sensitivity as judged from the seed germination, cotyledon greening and the relative root growth under salt stress. Constitutive expression of TaACO1 in Arabidopsis increased AtMYB15 expression and suppressed the expression of stress-responsive genes AtRAB18, AtCBF1 and AtCBF3. These findings are helpful in understanding the roles of ethylene biosynthesis in plant salt-stress response.

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