Journal of Integrative Agriculture ›› 2025, Vol. 24 ›› Issue (7): 2492-2510.DOI: 10.1016/j.jia.2023.12.036

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大豆苹果酸脱氢酶基因家族特征分析表明GmMDH2提高大豆耐盐能力

  

  • 收稿日期:2023-08-22 修回日期:2024-01-03 接受日期:2023-11-17 出版日期:2025-07-20 发布日期:2025-06-17

Genome-wide characterization of soybean malate dehydrogenase genes reveals a positive role for GmMDH2 in the salt stress response

Runnan Zhou1*, Sihui Wang1*, Peiyan Liu1*, Yifan Cui1, Zhenbang Hu2, Chunyan Liu2, Zhanguo Zhang2, Mingliang Yang2, Xin Li3, Xiaoxia Wu1#, Qingshan Chen2#, Ying Zhao1#   

  1. 1 Heilongjiang Green Food Science Research Institute, Harbin 150000, China

    2 National Key Laboratory of Smart Farm Technology and System/Key Laboratory of Soybean Biology, Ministry of Education/ College of Agriculture, Northeast Agricultural University, Harbin 150000, China

    3 Key Laboratory of Maize Genetics and Breeding, Heilongjiang Academy of Agricultural Sciences, Harbin 150000, China 

  • Received:2023-08-22 Revised:2024-01-03 Accepted:2023-11-17 Online:2025-07-20 Published:2025-06-17
  • About author:Runnan Zhou, E-mail: runnanzhou@126.com; Sihui Wang, E-mail: 13074558253@163.com; Peiyan Liu, E-mail: liupeiyan823@163.com; #Correspondence Xiaoxia Wu, Tel: +86-451-55190481, E-mail: xxwu2012@126.com; Qingshan Chen, Tel: +86-451-55191259, E-mail: qshchen@126.com; Ying Zhao, E-mail: tianshi198937@126.com * These authors contributed equally to this study.
  • Supported by:
    This study was financially supported by the Natural Science Foundation of Heilongjiang Province, China (TD2022C003 and YQ2022C010), the National Key R&D Program of China (2021YFD1201104-02-02 and 2021YFF1001202), and the National Natural Science Foundation of China (U20A2027, 31971899, 32272093, and 32272072).

摘要:

苹果酸脱氢酶(MDH)是一种在植物体内广泛表达的酶。虽然MDH在植物生长发育、响应逆境过程中起着关键作用。但是在大豆中MDH基因研究的报道有限。我们通过全基因组分析鉴定了大豆MDH基因家族的17个成员,并分析了成员间的保守蛋白质基序。根据系统发育关系,将17个大豆MDH基因家族成员分为了五个亚群,通过共聚焦显微镜观察了6个MDH基因家族成员在拟南芥叶肉原生质体的亚细胞定位情况。通过启动子顺式作用元件和qRT-PCR分析发现,在非生物胁迫(干旱、盐碱)和激素处理下,MDH家族成员的转录水平显著提升,并表现出明显的时空特异性。在盐胁迫下, GmMDH2表达量明显提高,说明GmMDH2可能在大豆相应盐胁迫过程中发挥重要功能。GmMDH2的原核表达说明该重组酶具有NADP依赖性的MDH活性。进一步研究表明,过表达GmMDH2可以调节NADPH库的氧化还原状态和抗氧化活性,从而减少了转基因大豆中ROS的形成,显著提高了转基因大豆的耐盐性。基于单倍型分析表明,GmMDH2基因的变异与大豆的耐盐性密切相关。在GmMDH2基因启动子区域发现了一个可能与耐盐性相关的多态性位点。我们的研究不仅鉴定了大豆MDH基因家族成员,加深了我们对逆境反应机制的理解,同时也为大豆耐盐育种提供了一个潜在的候选基因。

Abstract:

Malate dehydrogenase (MDH) is a widely expressed enzyme that plays a key role in plant growth, development, and stress responses.  However, information on MDH genes in the soybean genome is limited.  Seventeen members of the soybean MDH family were identified by genome-wide analysis, and the genes were analyzed for the presence of conserved protein motifs.  The genes were divided into five clusters according to their phylogenetic relationships.  The intracellular localizations of six GmMDHs were determined by confocal microscopy of Arabidopsis mesophyll protoplasts.  Transcripts of GmMDHs were significantly increased by abiotic stress (drought, salt, and alkalinity) and hormone treatments, as shown by an analysis of cis-regulatory elements and quantitative real-time polymerase chain reaction (qRT-PCR).  The GmMDHs displayed unique expression patterns in various soybean tissues.  Notably, the expression levels of a chloroplast isoform (GmMDH2) were unusually high under salt stress, presumably indicating a critical role in soybean responses to salinity.  Expression of GmMDH2 in Escherichia coli showed that the recombinant enzyme has nicotinamide adenine dinucleotide phosphate (NADP)-dependent MDH activity.  The redox states of the NADP (reduced form) (NADPH) pool and antioxidant activities were shown to be modulated by GmMDH2 gene overexpression, which in turn reduced reactive oxygen species (ROS) formation in transgenic soybean, significantly enhancing the salt stress resistance.  Gene-based association analysis showed that variations in GmMDH2 were strongly linked to seedling salt tolerance.  A polymorphism potentially associated with salt tolerance was discovered in the promoter region of GmMDH2.  These findings not only improve our understanding of the stress response mechanism by identifying and characterizing the MDH gene family throughout the soybean genome but they also identified a potential candidate gene for the future enhancement of salt tolerance in soybean.  

Key words: soybean (Glycine max (Linn.) Merr.) , malate dehydrogenase , expression profile , salt stress