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Proteomics of Salt Gland-Secreted Sap Indicates a Pivotal Role for Vesicle Transport and Energy Metabolism in Plant Salt Secretion

文献类型： 外文期刊

作者： Lu, Chaoxia 1 ; Zhang, Yuanyuan 1 ; Mi, Ping 1 ; Guo, Xueying 1 ; Wen, Yixuan 1 ; Han, Guoliang 1 ; Wang, Baoshan 1 ;

作者机构： 1.Shandong Normal Univ, Coll Life Sci, Shandong Prov Key Lab Plant Stress Res, Jinan 250014, Peoples R China

2.Shandong Acad Agr Sci, Shandong Prov Key Lab Crop Genet Improvement, Jinan 250100, Peoples R China

关键词： Limonium bicolor; proteomics; salt gland; secretion; vesicular transport

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 22 期

页码：

收录情况： SCI

摘要： Soil salinization is one of the major factors restricting crop growth and agricultural production worldwide. Recretohalophytes have developed unique epidermal structures in their aboveground tissues, such as salt glands or salt bladders, to secrete excess salt out of the plant body as a protective mechanism from ion damage. Three hypotheses were proposed to explain how salt glands secrete salts: the osmotic hypothesis, a hypothesis similar to animal fluid transport, and vesicle-mediated exocytosis. However, there is no direct evidence to show whether the salt gland-secreted liquid contains landmark proteins or peptides which would elucidate the salt secretion mechanism. In this study, we collected the secreted liquid of salt glands from Limonium bicolor, followed by extraction and identification of its constituent proteins and peptides by SDS-PAGE and mass spectrometry. We detected 214 proteins and 440 polypeptides in the salt gland-secreted droplets of plants grown under control conditions. Unexpectedly, the proportion of energy metabolism-related proteins increased significantly though only 16 proteins and 35 polypeptides in the droplets of salt-treated plants were detected. In addition, vesicle transport proteins such as the Golgi marker enzyme glycosyltransferase were present in the secreted sap of salt glands from both control and salt-treated plants. These results suggest that trans-Golgi network-mediated vesicular transport and energy production contributes to salt secretion in salt glands.

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