Ethylene-independent signaling by the ethylene precursor ACC in Arabidopsis ovular pollen tube attraction

Wangshu Mou, Yun-Ting Kao, Erwan Michard, Alexander A. Simon, Dongdong Li, Michael M. Wudick, Michael A. Lizzio, José A. Feijó () and Caren Chang ()
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Wangshu Mou: University of Maryland
Yun-Ting Kao: University of Maryland
Erwan Michard: University of Maryland
Alexander A. Simon: University of Maryland
Dongdong Li: University of Maryland
Michael M. Wudick: University of Maryland
Michael A. Lizzio: University of Maryland
José A. Feijó: University of Maryland
Caren Chang: University of Maryland

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: 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 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 Ca2+-containing ion currents via GLUTAMATE RECEPTOR-LIKE (GLR) channels in root protoplasts. In COS-7 cells expressing moss PpGLR1, 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.

Date: 2020
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DOI: 10.1038/s41467-020-17819-9

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