单词	abscisic acid
释义	abscisic acid noun ab·​scis·​ic acid ˌab-ˈsi-zik-  -sik- : a plant hormone C15H20O4 that is a sesquiterpene widespread in nature and that typically promotes leaf abscission and dormancy and has an inhibitory effect on cell elongation Example Sentences Recent Examples on the Web The researchers compared how different plants within this family responded to the release of abscisic acid. Ashley Strickland, CNN, 2 May 2022 The older trees had lower levels of a growth hormone called indole-3-acetic acid and higher levels of a growth-inhibiting hormone called abscisic acid. Erin Malsbury, Science | AAAS, 13 Jan. 2020 The seed has two hormones: abscisic acid (ABA), which sends the signal to stay dormant, and gibberellin (GA), which initiates germination. Jason Daley, Smithsonian, 9 June 2017 Word History Etymology abscision (variant of abscission) + -ic entry 1 First Known Use 1968, in the meaning defined above
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