Abbreviation for abscisic acid; see there.
The phytohormone (ABA) discovered in the 1950s has a growth-regulating effect in plants in interaction with auxins, cytokinins and gibberellins. The effect of the growth-promoting hormones is cancelled out and causes bud dormancy in already lignified, perennial plants. In vines, it is involved in Blattfallleaf...
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