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. 1978 Aug;62(2):224–228. doi: 10.1104/pp.62.2.224

Endogenous Gibberellin and Abscisic Acid Content as Related to Senescence of Detached Lettuce Leaves 1

Nehemia Aharoni 1,2,2, Amos E Richmond 1,2
PMCID: PMC1092094  PMID: 16660490

Abstract

Levels of gibberillins (GAs) and of abscisic acid (ABA) in attached leaves of romaine lettuce (Lactuca sativa L.) declined as the leaf became older. The time course of changes in hormone levels, determined in detached lettuce leaves kept in darkness, revealed that a sharp decline in GAs accompanied by a moderate rise in ABA occurred before the onset of chlorophyll degradation. As senescence advanced, no GAs could be detected and a considerable rise of ABA was observed. A similar sequence of hormonal modifications, but more pronounced, was observed in the course of accelerated senescence induced by either Ethephon or water stress. When kinetin or GA3 was applied to detached leaves, the loss of chlorophyll and the rise in ABA were reduced. Bound GAs were detected in senescent leaves. They were not found in the kinetin-treated leaves, which contained a relatively high level of free GAs. The results suggest that senescence in detached romaine lettuce leaves is connected with a depletion of free GAs and cytokinins, which is thereafter followed by a great surge in ABA.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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