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Carotenoid accumulation in tomato ( Solanum lycopersicum ) fruits is influenced by environmental  stimuli  and hormonal signals. However, information on the relative regulatory mechanisms are scanty since many molecular players of the carotenoid biosynthetic pathway are still unknown. Here, we reported a basic Helix-Loop-Helix transcription factor, named SlARANCIO (SlAR), whose silencing influences carotenoid accumulation in tomato fruits. The  SlAR  gene was found in the  S .  pennellii  introgression line (IL) 12-4SL that holds the carotenoid QTL lyc12.1. We observed that the presence of the wild region in a cultivated genetic background led to a decrease in total carotenoid content of IL12-4SL fruits. To get insights into the function of  SlAR , a quick reverse genetic approach was carried out. Virus-induced gene silencing of  SlAR  in  S .  lycopersicum  M82 and MicroTom fruits reproduced the same phenotype observed in IL12-4SL, i.e. decreased content of lycopene and total carotenoids. Vice versa, the overexpression of  SlAR  in  Nicotiana benthamiana  leaves increased the content of total carotenoids and chlorophylls. Our results, combined with public transcriptomic data, highly suggest that  SlAR  acts indirectly on the carotenoid pathway and advances current knowledge on the molecular regulators controlling lyc12.1 and, potentially, precursors of carotenoid biosynthesis.

A basic Helix-Loop-Helix (SlARANCIO), identified from a Solanum pennellii introgression line, affects carotenoid accumulation in tomato fruits