abscisins
n. C1 Advanced ab·scisins
n. a type of plant hormone that helps control when leaves fall off a tree and when seeds start to grow.
n. a group of plant hormones, primarily abscisic acid, that regulate processes such as leaf abscission and seed dormancy.
Abscisins help plants prepare for winter by closing their stomata.
The plant produces abscisins to signal the leaves to drop when the weather becomes too cold.
Researchers are studying how abscisins interact with other growth hormones to determine the precise timing of fruit ripening and leaf shedding in response to environmental stress.