ArticleThe Plant journal : for cell and molecular biology2026
The plant longevity gene AHL15 delays leaf senescence by repressing ORESARA1 and cytokinin degradation.
Article in The Plant journal : for cell and molecular biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The Arabidopsis thaliana (Arabidopsis) AT-HOOK MOTIF NUCLEAR LOCALIZED 15 (AHL15) gene is associated with various longevity phenotypes and extends the life span of plants when overexpressed. In this study, we show that, in addition to previously described longevity phenotypes, constitutive overexpression of AHL15 in Arabidopsis delays leaf senescence, whereas ahl15 loss of function accelerates this process. Dexamethasone-induced nuclear localization of AHL15-GR during dark-triggered senescence results in a stay-green phenotype and represses the expression of several early senescence-associated genes. Among these, the ORESARA1 (ORE1) locus is directly bound by AHL15, suggesting a direct delaying effect of AHL15 on senescence. Furthermore, we demonstrate that AHL15 acts by directly repressing the expression of several CYTOKININ OXIDASE (CKX) genes involved in cytokinin inactivation, resulting in delayed degradation of cytokinins during dark-induced senescence. Cytokinins are known to inhibit senescence, and this, together with the downregulation of ORE1 expression, explains the delaying effect of AHL15 on senescence.
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