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Transcriptome Profiling of bending fruit and Functional Analysis of an ERF/AP2 Family Gene CsERF025 Involved in bending fruit development in cucumber (Cucumis sativus L.)

ABSTRACT: To identify the differentially expressed genes(DEGs) in the ventral and dorsal of cucumber bending fruits，cucumber bending fruit mRNA profiles of 2-day-old ventral and dorsal were generated by deep sequencing. After removing the low quality reads, the total number of clean reads in two library were 27.07 million and16.52 million, accounted for 85.21% and 80.71% of total reads .We identified a total of 4313 sequences differentially expressed in ventral and dorsal of bending fruit with a 2-fold or greater change and P < 0.01 , the Dorsal (D2) served as a control, in which 2351 up-regulated genes and 1962 down-regulated genes.For up-regulated genes, protein kinase activity, ethylene mediated signaling pathway, regulation of cell shape, auxin polar transport were significantly enriched, whereas down-regulated genes, the functional classes photosynthesis, oxidation reduction, response to auxin stimulus were significantly enriched. Moreover, among DEGs related to ethylene, we identified an ERF/AP2 gene CsERF025 that was significant difference in the dorsal and ventral of cucumber. up-regulation of CsERF025 in cucumber promoted fruit bendng and Increased the fruit bending angle, suggesting that CsERF025 plays an important role in cucumber bending fruit.

ORGANISM(S): Cucumis sativus

PROVIDER: GSE91085 | GEO | 2019/12/07

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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Transcriptome Profiling of bending fruit and Functional Analysis of an ERF/AP2 Family Gene CsERF025 Involved in bending fruit development in cucumber (Cucumis sativus L.)

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