Identification of the Na+ transporter gene MdNCL4 in response to high salinity stress in apple rootstock (Malus domestica (Suckow) Borkh.)
文献类型： 外文期刊
第一作者： Guo, Xinxin
作者： Guo, Xinxin;Shi, Tianle;Zhou, Jia;Yang, Yuzhang;Li, Minji;Zhang, Junke;Li, Xingliang;Guo, Xinxin;Shi, Tianle;Zhou, Jia;Yang, Yuzhang;Li, Minji;Zhang, Junke;Li, Xingliang
作者机构：
关键词： Apple; salt stress; Na+ transport; gene expression; Na+/Ca2+ exchanger
期刊名称：JOURNAL OF HORTICULTURAL SCIENCE & BIOTECHNOLOGY （ 影响因子：2.1； 五年影响因子：2.4 ）
ISSN： 1462-0316
年卷期： 2025 年
页码：
收录情况： SCI
摘要： Sodium ion (Na+) transport in plants directly affects salt tolerance. Therefore, identifying key Na+ transport genes is important for breeding salt-tolerant plants. In this study, a total of 97 genes were identified in six transporter families in apple (Malus domestica (Suckow) Borkh.) through a genome-wide screening for Na+/K+ transport-related genes. Under high-salt stress, 12 genes were up-regulated in the roots. Notably, Na+/Ca2+ exchanger-like protein 4 (MdNCL4) showed the strongest positive response to salt stress and the highest root-tissue specific expression. We determined that MdNCL4 localised to the plasma membrane in Arabidopsis protoplasts; heterologous expression showed function complementation in yeast Na+ efflux mutants. This supported its function in transporting Na+ from the cytoplasm to the extracellular space. Association analysis showed that MdNCL4 co-expressed with known salt-tolerance genes, including NAC transcription factor (NAC69) and dehydrin 1 (DHN1). These findings enrich current understanding of Na+ transport and may be useful for salt-tolerant breeding of apple rootstocks.
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