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Identification of MYB/bHLH proteins required for tissue-specific anthocyanin biosynthesis in inner pericarp of red-centered Actinidia chinensis cv. Hongyang

ABSTRACT: In the present study, we employed the high-throughput sequencing technology to profile miRNAs in the inner and outer pericarp of Actinidia chinensis cv. Hongyang. After sequencing and cleaning, the numbers of clean reads generated from these four libraries were 18,203,332, 9,356,430, 11,006,231 and 11,314,375, respectively. Approximately 93.62%, 93.67%, 92.75% and 93.28% clean reads were respectively mapped to the kiwifruit genome with perfect matches. Subsequently, differentially expressed genes were compared between the inner and outer pericarps. Significant differences in both up- and down-regulated genes were identified in inner and outer percarps by comparing expression levels. The results showed that there were significantly 450 up-regulated and 416 down-regulated DEGs in inner pericarp as compared to the outer pericarp.

ORGANISM(S): Actinidia chinensis

PROVIDER: GSE108099 | GEO | 2018/01/01

SECONDARY ACCESSION(S): PRJNA422451

REPOSITORIES: GEO

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Project description:Purpose: Cucumber (Cucumis sativus L.) is an economically important vegetable crop worldwide, and cucumber fruit spine density has an important impact on the commercial value. However, little is known about the regulatory mechanism for the fruit spine formation.In this study, the transcriptome analyses of ovaries and pericarps from numerous-spine parent and few-spine parent were conducted to identify the gene regulatory networks involved in the formation and development of numerous fruit spines in cucumber. Methods: Cucumber mRNA profiles of ovaries and pericarps from numerous-spine parent and few-spine parent were generated by deep sequencing, in triplicate, using Illumina HiSeq 4000. Then, clean data (clean reads) were obtained by removing reads containing adapters, reads containing poly-N sequences and low-quality reads from the raw data. Simultaneously, the Q20, Q30 and GC contents of the clean data were calculated. All of the downstream analyses were based on the high-quality clean data. Clean paired-end reads were mapped to the reference genome using TopHat v2.0.12 (Trapnell et al. 2012). Then, the FPKM (fragments per kilobase of transcript sequence per million base pairs sequenced) value of each gene was calculated to estimate gene expression levels (Trapnell et al. 2010). Genes with an adjusted P-value < 0.05 identified by DESeq were assigned as differentially expressed genes(DEGs). Results: We generated 42.96-57.53 million raw reads from each library, and 39.85-54.02 million clean reads were obtained after the removal of low-quality reads and adapter sequences. Among the clean reads, 79.03-80.94% were mapped to the gene database . Based on the KEGG database, pathway enrichment analysis was performed to identify significantly enriched metabolic pathways or signal transduction pathways in DEGs. Plant hormone signal transduction was significantly enriched in up-regulated genes in both F_6DBF compared with M_6DBF and F_0DAA compared with M_0DAA. Conclusions: Based on the transcriptome analysis, we excavated possible biological regulatory networks involved in the formation and development of numerous fruit spines in cucumber. This work will promote the exploration of molecular mechanisms that regulate cucumber fruit spine density.

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Identification of MYB/bHLH proteins required for tissue-specific anthocyanin biosynthesis in inner pericarp of red-centered Actinidia chinensis cv. Hongyang

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