ABA (Abscisic Acid) is a plant hormone that plays important role during many phases of the plant life cycle, including seed development and dormancy, embryo maturation, cell division and elongation, and in plant responses to various environmental stresses such as drought, salinity, cold, pathogen attack and UV radiation. However, despite the name, it does not appear to control Abscission directly; the presence of ABA in Abscising organs reflects its role in promoting senescence and/or stress responses, the processes prec...
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