Skip to main content
Fig. 7 | Molecular Horticulture

Fig. 7

From: The leaf senescence-promoting transcription factor AtNAP activates its direct target gene CYTOKININ OXIDASE 3 to facilitate senescence processes by degrading cytokinins

Fig. 7

ABA-AtNAP-AtCKX3-cytokinins in leaf senescence. The senescence hormone ABA induces the expression of AtNAP, a NAC family transcription factor (TF) gene. AtNAP physically binds to the motif 5’AgTcACGTG3’ of the AtCKX3 promoter to activate the gene expression to degrade cytokinins presented in the leaf; CK has been shown to inhibit leaf senescence (possibly via promoting stomatal closure), and the enzymatic removal of CK will facilitate the senescence processes. One the other hand, AtNAP has previously been shown to physically bind to the motif 5’CACGGTaAgT3’ of the SAG113 promoter to direct the protein phosphatase 2C expression, which in turn prevents stomatal from closure, leading to water loss and senescence. It should be noted that the motif of one gene promoter is very similar to the complementary sequence of the other gene’s motif

Back to article page