Fig. 6From: Tomato (Solanum lycopersicum) SlIPT4, encoding an isopentenyltransferase, is involved in leaf senescence and lycopene biosynthesis during fruit ripeningProposed model for SlIPT4 regulating lycopene biosynthesis and leaf senescence in tomato. SlIPT4 regulates the carotenoid biosynthesis via controlling the expression level of ZISO, and modulates leaf senescence through affecting the corresponding CK biosynthesis. The alteration of carotenoid biosynthesis affects directly the supply of ABA precursors, and also ABA accumulation is regulated by the correlation between CKs and ABA. ABA feedback regulates the expression level of the first gene PSY1 in carotenoid biosynthesis pathwayBack to article page