New opinion of sugar and light crosstalk in the induction of anthocyanins biosynthesis in fruits

Anthocyanins have antioxidant properties, protective cardiovascular diseases, cancer, diabetes, visual disturbances, liver damage, or UV-B radiation, plant development that make a major contribution to the quality of fruits. The crosstalk amongst light, sugar, DELLAs and UV RESISTANCE LOCUS8 (UVR8) for anthocyanins accumulation was investigated. The UV-B irradiation significantly increased UVR8 and COP1 with the contribution of monomeric UVR8 to form a complex (UVR8-COP1-SPA) that regulates the transcription of specific anthocyanins biosynthesis genes. Sucrose increases the stabilization of DELLAs and degradation of gibberellins and activates the structural genes of anthocyanins biosynthesis. In this opinion article, DELLAs and HY5 transcription factors have emerged as hubs under the sugar and light regulation networks in anthocyanins biosynthesis. A better understanding of these regulatory networks is able to beneficial for breeding programs directing to modify the anthocyanins.