Blue Light Simultaneously Induces Peel Anthocyanin Biosynthesis and Flesh Carotenoid/Sucrose Biosynthesis in Mango Fruit

Previous studies focused on the effects of light on fruit
appearance,
especially the peel color. However, the effect of light on fruit internal
quality and the underlying mechanisms are unclear. In this study,
we analyzed the effects of blue light on the appearance and internal
quality of mango fruit (Mangifera indica L.). Blue light simultaneously induced peel anthocyanin and flesh
sucrose/carotenoid biosynthesis in mango fruit. Analyses of co-expression
networks and gene expression trends in mango fruit peel and flesh
identified candidate genes, including transcription factor genes,
involved in blue light-regulated anthocyanin, carotenoid, and sucrose
biosynthesis pathways. Key blue light signaling-related genes (MiCRY and MiHY5) and blue light-triggered
phytohormones were involved in these pathways. Additionally, there
were common and tissue-specific pathways for the blue light-promoted
accumulation of anthocyanins, carotenoids, and sucrose. Our results
provide new insights into the regulatory effects of light on the appearance
and internal quality of mango fruit.