Transcriptomic analyses for grape peel color regulation under different grafting conditions

According to the field observation result, the grafting treatment used in this study was found that 101-14MG rootstocks grafted with Crimson Seedless had a positive influence on fruit coloring. Combined metabolomic and transcriptomic analyses were conducted with different treatment grape of own rooted Crimson Seedless cultivar, and grafted 101-14MG, 110R, SO4 rootstocks with Crimson Seedless cultivar. Peonidin 3-O-glucoside, Delphinidin 3-O-glucoside, Cyanidin 3-O-glucoside, Malvidin 3-O-glucoside, Petunidin 3-O-glucoside were identified as the pigments responsible for the purplish red color peels. The results showed that the grafting material of rootstock 101-14MG could promote the accumulation of anthocyanins in grapefruit in advance. Transcriptome analysis revealed the anthocyanins biosynthetic related genes from the upstream (phenylalanine ammonia-lyase) to the downstream (anthocyanidin 3-O-glucosyltransferase, anthocyanidin synthase) were almost upregulation during anthocyanins increased. However, all these genes were highly expressed in samples G715 (Crimson Seedless/ Crimson Seedless), suggested that self-grafting rootstocks might have an earlier response to fruit color-related metabolism. A transcription factors-scale protein interaction (PPI) analysis showed that MYB4, MYB44, MYB80, and dead-box RNA helicases might be the core regulatory genes. Our results provide global transcriptional changes in grape peel color regulation under different grafting conditions for improving the breeding process. Overall design: RNA-seq experiments and analyses for the samples from r different grafting conditions