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Wang, Yuying; Hu, Yaping; Ren, Hongfang; Zhao, Xueqing; Yuan, Zhaohe
Food chemistry, 09/2024, Volume: 451Journal Article
The economic impact of fruit cracking in pomegranate products is substantial. In this study, we present the inaugural comprehensive analysis of transcriptome and metabolome in the outermost pericarp of pomegranate fruit in bagging conditions. Our investigation revealed a notable upregulation of differentially expressed genes (DEGs) associated with the calcium signaling pathway (76.92%) and xyloglucan endotransglucosylase/hydrolase (XTH) genes (87.50%) in the fruit peel of non-cracking fruit under bagging. Metabolomic analysis revealed that multiple phenolics, flavonoids, and tannins were identified in pomegranate. Among these, calmodulin-like 23 (PgCML23) exhibited a significant correlation with triterpenoids and demonstrated a marked upregulation under bagging treatment. The transgenic tomatoes overexpressing PgCML23 exhibited significantly higher cellulose content and xyloglucan endotransglucosylase (XET) enzyme activity in the pericarp at the red ripening stage compared to the wild type. Conversely, water-soluble pectin content, polygalacturonase (PG), and β-galactosidase (β-GAL) enzyme activities were significantly lower in the transgenic tomatoes. Importantly, the heterologous expression of PgCML23 led to a substantial reduction in the fruit cracking rate in tomatoes. Our findings highlight the reduction of fruit cracking in bagging conditions through the manipulation of PgCML23 expression. •Calcium content was significantly higher in fruit non-cracking under bagging treatment.•Analysis of outermost pericarp of pomegranate by transcriptome and metabolome.•A notable upregulation of DEGs associated with the calcium signaling pathway in the non-cracking pericarp under bagging.•Heterologous expression of PgCML23 in tomato significantly reduced fruit cracking by strengthening cell wall.
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