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Mou, Wangshu; Kao, Yun-Ting; Michard, Erwan; Simon, Alexander A; Li, Dongdong; Wudick, Michael M; Lizzio, Michael A; Feijó, José A; Chang, Caren
Nature communications, 08/2020, Letnik: 11, Številka: 1Journal Article
The phytohormone ethylene has numerous effects on plant growth and development. Its immediate precursor, 1-aminocyclopropane-1-carboxylic acid (ACC), is a non-proteinogenic amino acid produced by ACC SYNTHASE (ACS). ACC is often used to induce ethylene responses. Here, we demonstrate that ACC exhibits ethylene-independent signaling in Arabidopsis thaliana reproduction. By analyzing an acs octuple mutant with reduced seed set, we find that ACC signaling in ovular sporophytic tissue is involved in pollen tube attraction, and promotes secretion of the pollen tube chemoattractant LURE1.2. ACC activates Ca -containing ion currents via GLUTAMATE RECEPTOR-LIKE (GLR) channels in root protoplasts. In COS-7 cells expressing moss PpGLR1, ACC induces the highest cytosolic Ca elevation compared to all twenty proteinogenic amino acids. In ovules, ACC stimulates transient Ca elevation, and Ca influx in octuple mutant ovules rescues LURE1.2 secretion. These findings uncover a novel ACC function and provide insights for unraveling new physiological implications of ACC in plants.
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