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Arabidopsis thaliana ACS8 plays a crucial role in the early biosynthesis of ethylene elicited by Cu2+ ions

Baogang Zhang,Haifeng Liu,Xinhua Ding,J. Qiu,Min Zhang,Z. Chu

Published 2018 in Journal of Cell Science

ABSTRACT

ABSTRACT Cu2+ ions are required by all living organisms and play important roles in many bactericides and fungicides. We previously reported that Cu2+ can elicit defense responses, which are dependent on the ethylene signaling pathway in Arabidopsis. However, the mechanism by which Cu2+ elicits the biosynthesis of ethylene remains unclear. Here, we show that CuSO4 treatment rapidly increases the production of ethylene. In addition, it upregulates the expression of several defense-related genes and ethylene biosynthesis genes, including genes encoding S-adenosylmethionine synthase, 1-aminocyclopropane-1-carboxylate (ACC) synthase (ACS) and ACC oxidase. Among these genes, Arabidopsis thaliana (At)ACS8 was identified as essential for the defense response and early ethylene biosynthesis induced by Cu2+. Furthermore, Cu2+-induced AtACS8 expression depended on the copper-response cis-element (CuRE) in the promoter of AtACS8. Our study indicates that Cu2+ specifically activates the expression of AtACS8 to promote the early biosynthesis of ethylene that elicits plant immunity in Arabidopsis plants. Summary: Cu2+ ions activate expression of the Arabidopsis thaliana ACS8 gene to promote ethylene biosynthesis and elicit a defense response that is dependent on the CuRE regulatory element.

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