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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\n                    <jats:italic>Arabidopsis thaliana<\/jats:italic>\n                    reproduction. By analyzing an\n                    <jats:italic>acs<\/jats:italic>\n                    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\n                    <jats:sup>2+<\/jats:sup>\n                    -containing ion currents via GLUTAMATE RECEPTOR-LIKE (GLR) channels in root protoplasts. In COS-7 cells expressing moss\n                    <jats:italic>Pp<\/jats:italic>\n                    GLR1, ACC induces the highest cytosolic Ca\n                    <jats:sup>2+<\/jats:sup>\n                    elevation compared to all twenty proteinogenic amino acids. In ovules, ACC stimulates transient Ca\n                    <jats:sup>2+<\/jats:sup>\n                    elevation, and Ca\n                    <jats:sup>2+<\/jats:sup>\n                    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.\n                  <\/jats:p>","DOI":"10.1038\/s41467-020-17819-9","type":"journal-article","created":{"date-parts":[[2020,8,14]],"date-time":"2020-08-14T08:22:04Z","timestamp":1597393324000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":142,"title":["Ethylene-independent signaling by the ethylene precursor ACC in Arabidopsis ovular pollen tube attraction"],"prefix":"10.1038","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4585-8791","authenticated-orcid":false,"given":"Wangshu","family":"Mou","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3163-1238","authenticated-orcid":false,"given":"Yun-Ting","family":"Kao","sequence":"additional","affiliation":[]},{"given":"Erwan","family":"Michard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3961-4803","authenticated-orcid":false,"given":"Alexander A.","family":"Simon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7464-6478","authenticated-orcid":false,"given":"Dongdong","family":"Li","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4332-369X","authenticated-orcid":false,"given":"Michael M.","family":"Wudick","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1842-9206","authenticated-orcid":false,"given":"Michael A.","family":"Lizzio","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1100-5478","authenticated-orcid":false,"given":"Jos\u00e9 A.","family":"Feij\u00f3","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0384-5888","authenticated-orcid":false,"given":"Caren","family":"Chang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,8,14]]},"reference":[{"key":"17819_CR1","unstructured":"Abeles, F. 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