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Green, Marriah N. ; Gangwar, Shanti Pal ; Michard, Erwan ; Simon, Alexander A. ; Portes, Maria Teresa ; Barbosa-Caro, Juan ; Wudick, Michael M. ; Lizzio, Michael A. ; Klykov, Oleg ; Yelshanskaya, Maria V. ; et al ( , Molecular Cell)null (Ed.)
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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)
Abstract 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 anacs 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 Ca2+-containing ion currents via GLUTAMATE RECEPTOR-LIKE (GLR) channels in root protoplasts. In COS-7 cells expressing mossPp GLR1, ACC induces the highest cytosolic Ca2+elevation compared to all twenty proteinogenic amino acids. In ovules, ACC stimulates transient Ca2+elevation, and Ca2+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. -
Wudick, Michael M. ; Portes, Maria Teresa ; Michard, Erwan ; Rosas-Santiago, Paul ; Lizzio, Michael A. ; Nunes, Custódio Oliveira ; Campos, Cláudia ; Santa Cruz Damineli, Daniel ; Carvalho, Joana C. ; Lima, Pedro T. ; et al ( , Science)