Mining genes related to single fruit weight of peach (Prunus persica) based on WGCNA and GSEA

Single fruit weight is an important goal of crop production and horticultural species domestication, but its genetic mechanism is still unclear. In this study, the fruits of different peach fruit types in the first rapid development period were used as materials. First, the differentially expressed genes were analyzed by RNA-seq data. Secondly, using WGCNA to calculate the correlation between genes and modules, the genes with different expression patterns were divided into 17 modules, and then the modules were correlated with the phenotype of single fruit, and a highly correlated Blue module was obtained. Then, the possible differentially expressed genes and signal pathways among different fruit types were compared by GSEA analysis, and 43 significant pathways were obtained. Finally, 54 genes repeatedly expressed in three methods were screened, and 11 genes involved in plant hormone signal transduction were selected for subsequent analysis according to their functional annotations. Combined with the changing trend of phenotype, three genes (Prupe.7G234800, Prupe.8G079200 and Prupe.8G082100) were obtained as candidate genes for single fruit weight traits. All three genes are involved in auxin signal transduction, auxin plays an important role in plant growth and development. This discovery provides a new perspective for revealing the genetic law of single fruit weight in peach.