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Fig. 10 | Molecular Horticulture

Fig. 10

From: The NAC transcription factor MdNAC4 positively regulates nitrogen deficiency-induced leaf senescence by enhancing ABA biosynthesis in apple

Fig. 10

A working model of the MdNAC4-mediated regulation of N deficiency-induced leaf senescence in apple. Under N-deficient conditions, N starvation-responsive genes are activated, which induces the expression of MdNAC4. MdNAC4 directly activates the expression of the ABA biosynthesis gene MdNCED2 and further promotes ABA biosynthesis. The ABA receptor protein MdPYL4 interacts with the MdNAC4 protein and enhances the response of MdNAC4 to N deficiency. MdNAC4 directly binds to the SAG MdSAG39 and activates its expression, thus promoting leaf senescence induced by N deficiency. Under N-sufficient conditions, N starvation-responsive genes are suppressed. MdPYL4 interacts with MdNAC4 proteins to activate the expression of SAG MdSAG39, thus regulating leaf senescence

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Molecular Horticulture

ISSN: 2730-9401

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