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date: 15 December 2019

abscisic acid (ABA) 

Source:
A Dictionary of Biology
Author(s):
Elizabeth MartinElizabeth Martin, Robert HineRobert Hine

A naturally occurring *plant hormone that appears to be involved primarily in seed maturation, stress responses, and in regulating closure of leaf pores (stomata). In seeds, it promotes the synthesis of storage protein and prevents premature germination. In leaves, abscisic acid is produced in large amounts when the plant lacks sufficient water, promoting closure of stomata and hence reducing further water losses. Levels of abscisic acid increase suddenly in response to various forms of stress, including heating, waterlogging, and chilling. It was formerly believed to play a central role in ... ...

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