regulates anthocyanin accumulation in juvenile citrus tissues.

UNLABELLED

The anthocyanin accumulation in juvenile tissues can enhance the ornamental value, attract pollinators, and help improve abiotic stress. Although transcriptional regulation studies of anthocyanin have been relatively extensive, there are few reports on the mechanism of anthocyanin accumulation in young tissues. This study reveals that many juvenile citrus tissues (flowers, leaves, and pericarp) undergo transient accumulation of anthocyanins, exhibiting a red coloration. Using weighted gene co-expression network analysis (WGCNA) identified as a candidate gene. After detecting the expression levels of in various citrus juvenile tissues, the expression trend of was highly consistent with the red exhibiting and fading. Overexpression of in tobacco significantly increased the anthocyanin content. LUC and yeast one-hybrid assay demonstrated that could bind to the promoter of (encoding the key transcription factor promoting anthocyanin accumulation) and promote its expression. Finally, comparing the expression levels of and in the late development stage of blood orange found that was not the main regulatory factor for anthocyanin accumulation in the later stage. This study used reverse genetics to identify a transcription factor, CitWRKY75, upstream of , which promotes anthocyanin accumulation in citrus juvenile tissues.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1007/s11032-024-01490-9.