Effects of sunlight on anthocyanin accumulation and associated co-expression gene networks in developing grape berries

•Two Vitis species were found to accumulate anthocyanins under dark.•A co-expression network was constructed with three Vitis species transcriptomic data.•Hormone transductions might enhance anthocyanins accumulation under dark.•Protein postranslation modification and degradation might inhibited anthocyanin accumulation.