Genome-wide identification, phylogeny, and expression analysis of pectin methylesterases reveal their major role in cotton fiber development

文献类型： 外文期刊

第一作者： Weijie Li;;Haihong Shang

作者： Weijie Li;Haihong Shang;Qun Ge;Changsong Zou;Juan Cai;Daojie Wang;Senmiao Fan;Zhen Zhang;Xiaoying Deng;Yunna Tan;Weiwu Song;Pengtao Li;Palanga Kibalou Koffi;Muhammad Jamshed;Quanwei Lu;Wankui Gong;Junwen Li;Yuzhen Shi;Tingting Chen;Juwu Gong;Aiying Liu;Youlu Yuan

作者机构：

关键词： Cotton;Pectin methylesterases (PMEs);Gene family;Gene structure;Phylogeny;Expression patterns

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2016 年 17 卷

页码：

收录情况： SCI

摘要： Background: Pectin methylesterase (PME, EC 3.1.1.11) is a hydrolytic enzyme that utilizes pectin as substrates, and plays a significant role in regulating pectin reconstruction thereby regulating plant growth. Pectin is one of the important components of the plant cell wall, which forms the main structural material of cotton fiber. In this research, cotton genome information was used to identify PMEs. Results: We identified 80 (GaPME01-GaPME80) PME genes from diploid G. arboreum (A genome), 78 (GrPME01-GrPME78) PME genes from G. raimondii (D genome), and 135 (GhPME001-GhPME135) PME genes from tetraploid cotton G. hirsutum (AD genome). We further analyzed their gene structure, conserved domain, gene expression, and systematic evolution to lay the foundation for deeper research on the function of PMEs. Phylogenetic data indicated that members from the same species demonstrated relatively high sequence identities and genetic similarities. Analysis of gene structures showed that most of the PMEs genes had 2-3 exons, with a few having a variable number of exons from 4 to 6. There are nearly no differences in the gene structure of PMEs among the three (two diploid and one tetraploid) cotton species. Selective pressure analysis showed that the Ka/Ks value for each of the three cotton species PME families was less than one. Conclusion: Conserved domain analysis showed that PMEs members had a relatively conserved C-terminal pectinesterase domain (PME) while the N-terminus was less conserved. Moreover, some of the family members contained a pectin methylesterase inhibitor (PMEI) domain. The Ka/Ks ratios suggested that the duplicated PMEs underwent purifying selection after the duplication events. This study provided an important basis for further research on the functions of cotton PMEs. Results from qRT-PCR indicated that the expression level of different PMEs at various fiber developmental stages was different. Moreover, some of the PMEs showed fiber predominant expression in secondary wall thickening indicating tissue-specific expression patterns.

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