Characterization of pectin methylesterase gene family and its possible role in juice sac granulation in navel orange (Citrus sinensis Osbeck)
文献类型： 外文期刊
作者： Li, Zixuan 1 ; Wu, Liming 1 ; Wang, Ce 1 ; Wang, Yue 2 ; He, Ligang 1 ; Wang, Zhijing 1 ; Ma, Xiaofang 1 ; Bai, Fuxi 1 ; Feng, Guizhi 2 ; Liu, Jihong 2 ; Jiang, Yingchun 1 ; Song, Fang 1 ;
作者机构： 1.Hubei Acad Agr Sci, Inst Fruit & Tea, Wuhan 430064, Peoples R China
2.Huazhong Agr Univ, Coll Hort & Forestry Sci, Wuhan 430070, Peoples R China
关键词： Citrus sinensis; Pectin methylesterases (PMEs); Juice sac granulation; Transcription factor
期刊名称：BMC GENOMICS （ 影响因子：4.547； 五年影响因子：4.931 ）
ISSN： 1471-2164
年卷期： 2022 年 23 卷 1 期
页码：
收录情况： SCI
摘要： Background Citrus is one of the most important fresh fruit crops worldwide. Juice sac granulation is a physiological disorder, which leads to a reduction in soluble solid concentration, total sugar, and titratable acidity of citrus fruits. Pectin methylesterase (PME) catalyzes the de-methylesterification of homogalacturonans and plays crucial roles in cell wall modification during plant development and fruit ripening. Although PME family has been well investigated in various model plants, little is known regarding the evolutionary property and biological function of PME family genes in citrus. Results In this study, 53 non-redundant PME genes were identified from Citrus sinensis genome, and these PME genes were divided into four clades based on the phylogenetic relationship. Subsequently, bioinformatics analyses of gene structure, conserved domain, chromosome localization, gene duplication, and collinearity were performed on CsPME genes, providing important clues for further research on the functions of CsPME genes. The expression profiles of CsPME genes in response to juice sac granulation and low-temperature stress revealed that CsPME genes were involved in the low temperature-induced juice sac granulation in navel orange fruits. Subcellular localization analysis suggested that CsPME genes were localized on the apoplast, endoplasmic reticulum, plasma membrane, and vacuole membrane. Moreover, yeast one-hybrid screening and dual luciferase activity assay revealed that the transcription factor CsRVE1 directly bound to the promoter of CsPME3 and activated its activity. Conclusion In summary, this study conducts a comprehensive analysis of the PME gene family in citrus, and provides a novel insight into the biological functions and regulation patterns of CsPME genes during juice sac granulation of citrus.
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