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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

作者： Guo, Xinxin 1 ; Shi, Tianle 1 ; Zhou, Jia 1 ; Yang, Yuzhang 1 ; Li, Minji 1 ; Zhang, Junke 1 ; Li, Xingliang 1 ;

作者机构： 1.Key Lab Biol & Genet Improvement Hort Crops, Beijing, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing, Peoples R China

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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