The long noncoding RNA LINC15957 regulates anthocyanin accumulation in radish

Abstract

Radish (Raphanus sativus L.) is an important root vegetable crop belonging to the Brassicaceae family. Anthocyanin rich radish varieties are popular among consumers because of their bright color and high nutritional value. However, the underlying molecular mechanism responsible for skin and flesh induce anthocyanin biosynthesis in transient overexpression, gene silencing and transcriptome sequencing were used to verify its function in radish anthocyanin accumulation, radish remains unclear. Here, we identified a long noncoding RNA LINC15957, overexpression of LINC15957 was significantly increased anthocyanin accumulation in radish leaves, and the expression levels of structural genes related to anthocyanin biosynthesis were also significantly increased. Anthocyanin accumulation and expression levels of anthocyanin biosynthesis genes were significantly reduced in silenced LINC15957 flesh when compared with control. By the transcriptome sequencing of the overexpressed LINC15957 plants and the control, 5,772 differentially expressed genes were identified. A total of 3,849 differentially expressed transcription factors were identified, of which MYB, bHLH, WD40, bZIP, ERF, WRKY and MATE were detected and differentially expressed in the overexpressed LINC15957 plants. KEGG enrichment analysis revealed the genes were significant enriched in tyrosine, L-Phenylalanine, tryptophan, phenylpropanol, and flavonoid biosynthesis. RT-qPCR analysis showed that 8 differentially expressed genes (DEGs) were differentially expressed in LINC15957-overexpressed plants. These results suggested that LINC15957 involved in regulate anthocyanin accumulation and provide abundant data to investigate the genes regulate anthocyanin biosynthesis in radish.

Emerging roles and mechanisms of lncRNAs in fruit and vegetables

“…This involvement allows them to participate in the anthocyanin synthesis pathway [ 24 ]. Additionally, the expression of LNC610 [ 50 ] and LINC15957 [ 51 ] has also been reported to enhance anthocyanin accumulation in apple and radish, respectively.…”

“…For example, in tomato fruit, lncRNAZ078 targets ERFs, while lncRNAZ107 and lncRNAZ141 target MADS-box proteins and F-box proteins, respectively, to participate in regulating ET metabolism [ 93 ]. Overexpressing LINC15957 in Raphanus sativus leads to distinct expression patterns of several TFs, including MYB, bHLH, WD40, bZIP, ERF, WRKY, and MATE [ 51 ]. In apple, WRKY1 activates the expression of LNC499 by targeting its promoter, which subsequently regulates the expression of ERF109 through cis -regulation [ 95 ].…”

The ncRNAs Involved in the Regulation of Abiotic Stress-Induced Anthocyanin Biosynthesis in Plants

“…In addition, over-expressed miR397 delays fruit maturation, and the anthocyanin content also decreases [88]. Furthermore, in radish, overexpression of LINC15957 increases anthocyanin accumulation and the expression of anthocyanin biosynthetic genes in leaves [143]. Many lncRNAs have been identified to be involved in anthocyanin biosynthesis through targeting miRNAs or directly affecting the expression of anthocyanin biosynthetic genes.…”