Petiole Pithiness in Celery Leaves: Induction by Environmental Stresses and the Involvement of Abscisic Acid
1979; Wiley; Volume: 47; Issue: 1 Linguagem: Inglês
10.1111/j.1399-3054.1979.tb06513.x
ISSN1399-3054
Autores Tópico(s)Plant responses to water stress
ResumoAbstract Petiole pithiness in celery, Apium graveolens L., was found to be stimulated by several types of root stress. Flooding of the root zone as well as nutrition deficiency required a prolonged period (25–30 days), but water deprivation had a rapid (2–3 days) effect on pithiness development. Pithiness development induced by water deprivation is not reversible upon rehydration of whole plants but is reversible upon rehydration of affected petiole slices. The stimulation of water stress‐related pithiness was found to be associated with an increased level of endogenous free abscisic acid (ABA). Exogenously applied ABA stimulated petiole pithiness of detached leaves in a concentration‐dependent fashion. It is suggested that in celery, ABA is an agent which mediates stimulation of petiole pithiness by water stress.
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