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Genome-wide identification of candidate aquaporins involved in water accumulation of pomegranate outer seed coat

文献类型： 外文期刊

作者： Liu, Jianjian 1 ; Qin, Gaihua 2 ; Liu, Chunyan 2 ; Liu, Xiuli 4 ; Zhou, Jie 4 ; Li, Jiyu 2 ; Lu, Bingxin 1 ; Zhao, Jianro 1 ;

作者机构： 1.Anhui Sci & Technol Univ, Coll Resource & Environm, Fengyang, Peoples R China

2.Anhui Acad Agr Sci, Inst Hort Res, Key Lab Genet Improvement & Ecophysiol Hort Crop, Hefei, Anhui, Peoples R China

3.Anhui Acad Agr Sci, Key Lab Fruit Qual & Dev Biol, Hefei, Peoples R China

4.Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou, Peoples R China

关键词： Aquaporin; Phylogenetics; Water accumulation; Outer seed coat; Pomegranate

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2021 年 9 卷

页码：

收录情况： SCI

摘要： Aquaporins (AQPs) are a class of highly conserved integral membrane proteins that facilitate the uptake and transport of water and other small molecules across cell membranes. However, little is known about AQP genes in pomegranate (Punica granatum L.) and their potential role in water accumulation of the outer seed coat. We identified 38 PgrAQP genes in the pomegranate genome and divided them into five subfamilies based on a comparative analysis. Purifying selection played a role in the evolution of PgrAQP genes and a whole-genome duplication event in Myrtales may have contributed to the expansion of PgrTIP, PgrSIP, and PgrXIP genes. Transcriptome data analysis revealed that the PgrAQP genes exhibited different tissue-specific expression patterns. Among them, the transcript abundance of PgrPIPs were significantly higher than that of other subfamilies. The mRNA transcription levels of PgrPIP1.3, PgrPIP2.8, and PgrSIP1.2 showed a significant linear relationship with water accumulation in seed coats, indicating that PgrPIP1.3/PgrPIP2.8 located in the plasma membrane and PgrSIP1.2 proteins located on the tonoplast may be involved in water accumulation and contribute to the cell expansion of the outer seed coat, which then develops into juicy edible flesh. Overall, our results provided not only information on the characteristics and evolution of PgrAQPs, but also insights on the genetic improvement of outer seed coats.

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