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De novo transcriptome assembly of Ipomoea nil using Illumina sequencing for gene discovery and SSR marker identification

文献类型: 外文期刊

作者: Wei, Changhe 1 ; Tao, Xiang 2 ; Li, Ming 3 ; He, Bin 1 ; Yan, Lang 1 ; Tan, Xuemei 1 ; Zhang, Yizheng 1 ;

作者机构: 1.Sichuan Univ, Coll Life Sci, Sichuan Key Lab Mol Biol & Biotechnol, Key Lab Bioresources & Ecoenvironm,Minist Educ, Chengdu 610064, Peoples R China

2.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China

3.Sichuan Acad Agr Sci, Inst Biotechnol & Nucl Technol, Chengdu 610061, Peoples R China

关键词: Ipomoea nil;Transcriptome;Flowering;Anthocyanins;Microsatellites

期刊名称:MOLECULAR GENETICS AND GENOMICS ( 影响因子:3.291; 五年影响因子:3.257 )

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收录情况: SCI

摘要: Ipomoea nil is widely used as an ornamental plant due to its abundance of flower color, but the limited transcriptome and genomic data hinder research on it. Using illumina platform, transcriptome profiling of I. nil was performed through high-throughput sequencing, which was proven to be a rapid and cost-effective means to characterize gene content. Our goal is to use the resulting information to facilitate the relevant research on flowering and flower color formation in I. nil. In total, 268 million unique illumina RNA-Seq reads were produced and used in the transcriptome assembly. These reads were assembled into 220,117 contigs, of which 137,307 contigs were annotated using the GO and KEGG database. Based on the result of functional annotations, a total of 89,781 contigs were assigned 455,335 GO term annotations. Meanwhile, 17,418 contigs were identified with pathway annotation and they were functionally assigned to 144 KEGG pathways. Our transcriptome revealed at least 55 contigs as probably flowering-related genes in I. nil, and we also identified 25 contigs that encode key enzymes in the phenylpropanoid biosynthesis pathway. Based on the analysis relating to gene expression profiles, in the phenylpropanoid biosynthesis pathway of I. nil, the repression of lignin biosynthesis might lead to the redirection of the metabolic flux into anthocyanin biosynthesis. This may be the most likely reason that I. nil has high anthocyanins content, especially in its flowers. Additionally, 15,537 simple sequence repeats (SSRs) were detected using the MISA software, and these SSRs will undoubtedly benefit future breeding work. Moreover, the information uncovered in this study will also serve as a valuable resource for understanding the flowering and flower color formation mechanisms in I. nil.

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