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Genome-wide identification, characterization, and expression analysis of the expansin gene family in watermelon (Citrullus lanatus)

文献类型： 外文期刊

作者： Gao, Wenrui 1 ; Li, Decui 1 ; Fan, Xiaoxue 1 ; Sun, Yanjun 1 ; Han, Bing 1 ; Wang, Xiansheng 3 ; Xu, Gang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vegetable Crop, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Germplasm Resources & Biotechnol, Nanjing 210014, Jiangsu, Peoples R China

4.Nanjing Stn DUS Testing Ctr New Varieties Plants, Nanjing 210014, Jiangsu, Peoples R China

关键词： Watermelon; Expansin; Development; Stress; Expression patterns

期刊名称：3 BIOTECH （ 影响因子：2.406； 五年影响因子：3.203 ）

ISSN： 2190-572X

年卷期： 2020 年 10 卷 7 期

页码：

收录情况： SCI

摘要： Expansins are plant cell-wall loosening proteins involved in cell enlargement, adaptive responses to environmental stimuli, and various developmental processes. Although expansins have been characterized in many plant species, little is reported on this family in watermelon. In this study, 30 expansin genes in the watermelon genome (ClEXPs) were identified. These genes which were divided into four subfamilies (7 ClEXLAs, 2 ClEXLBs, 18 ClEXPAs, and 3 ClEXPBs) are unevenly distribute on 10 of 11 watermelon chromosomes. Chromosome mapping suggested that tandem duplication events may have played important roles in the expanding of watermelon expansins. Gene structure and motif identification revealed that same subfamily and subgroup have conserved gene structure and motif. Detection ofcis-acting elements revealed that ClEXPs gene promoter regions were enriched with light-responsive elements, hormone-responsive, environmental stress-related, and development-related elements. Expression patterns of ClEXPs were investigated by qRT-PCR. The results showed that expression patterns of 15 ClEXP genes differed in three tissues. Through our own and public RNA-seq analysis, we found that ClEXPs had different expression patterns in fruit flesh, fruit rind, and seed at various developmental stages, and most of ClEXPs were highly responsive to abiotic and biotic stresses. Remarkably, 7 ClEXPs (ClEXLA1,ClEXLA6,ClEXLB1,ClEXLB2,ClEXPA5,ClEXPA10,andClEXPA16) exhibited positive response to at least three kinds of stresses, suggesting that they might play important roles in the crosstalk of stress signal pathways. The results of this study provide useful insights for the functional identification of expansin gene family in watermelon.

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