DING Tiyu
School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 453003MA Xinxin
School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 453003YU Xueli
School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 453003ZHOU Ruijin
School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 453003WANG Lirong
Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450000ZHAO Yalin
School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 4530031.School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology / Henan Engineering Research Center of the Development and Utilization of Characteristic Horticultural Plants / Xinxiang Key Laboratory of Germplasm Resources and Genetic Breeding in Pomology, Xinxiang 453003;2.Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450000
Foundation project: Science and Technology Program of Henan Province (222102110440,232102111083, 232102111087)
Bagging-produced flat peaches have gained increasing consumer preference due to their reduced fruit cracking, enhanced visual appeal, and golden to slightly reddish fruit surface. The cultivar ‘Zhongyoupan 9’ shows a distinctive reddish coloration under bagging conditions, attributed to anthocyanin synthesis. This characteristic makes it particularly suitable for bagging cultivation, aligning with consumer preferences for optimal color and appearance. In this study, we investigated the exocarp of bagged fruits of 'Zhongyoupan 9' at 89 and 102 days after blooming (DAFB), through an integrated approach combining transcriptomic, metabolomic, and bi-histological analyses to elucidate the coloration mechanism. Transcriptome analysis identified 2652 significant differential genes, including 16 genes associated with anthocyanin biosynthesis (PpPAL, PpC4H, Pp4CLs, PpCHSs, PpCHIs, PpF3H, PpF3'H, PpDFR, PpANS, PpUFGT, PpGST), 56 specifically up-regulated transcription factors, and phytoreceptors PpCRY3, PpUVR8.3. These genes were up-regulated and expressed correlating with anthocyanin content. Metabolomic profiling using high performance liquid tandem mass spectrometry detected 112 significantly differential metabolites, with cyanidin-3,5-O-diglucoside showing the most substantial up-regulation (Log2FC = 16.8). This metabolite was identified as the primary contributor to the red coloration in the exocarp after bagging. Integrative analysis of transcriptomic and metabolomics data, combined with transcription factor profiling, revealed that PpBL and PpNAC1 up-regulated and activated the anthocyanin regulatory gene PpMYB10.1. This activation promoted the catalytic synthesis of cyanidin-3,5-O-diglucoside by anthocyanin structural genes under bagging conditions, ultimately resulting in the characteristic red coloration of ‘Zhongyoupan 9’. These findings advance our understanding of anthocyanin accumulation patterns in bagged peach fruits and provide a theoretical basis for selecting optimal peach varieties for bagging cultivation practices.