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<p>Carbohydrates function as both energy sources and signaling molecules in various critical physiological processes. Monosaccharide transporters (MSTs) are a class of membrane-bound carrier proteins in crops that mediate the transmembrane transport of monosaccharides, thereby playing a central role in crop growth and development, resource allocation, and responses to environmental stimuli. In this study, a total of 200 <i>MST</i> family genes were identified in wheat and categorized into seven subfamilies. Twenty conserved motifs were detected within the TaMST family, with each subfamily exhibiting similar conserved motif patterns. The <i>TaMST</i> gene family was evenly distributed across the three wheat subgenomes, with both segmental and tandem duplications contributing to gene family expansion. The TaMST gene family was found to contain numerous cis-regulatory elements associated with growth and development, hormone signaling, and abiotic stress responses. Expression analysis revealed that most <i>TaMSTs</i> were expressed at low levels in wheat grains, whereas 69, 66, 67, and 64 genes exhibited high expression levels in leaves, buds, roots, and spikes, respectively. Following exogenous sugar treatments, the expression of all <i>TaMSTs</i> in roots was down-regulated, while 4, 2, and 3 genes showed up-regulated expression in leaves after treatment with fructose, glucose, and sucrose, respectively. Subcellular localization analysis demonstrated that TaERD3, TaPMT29, and TaSTP18 were all localized to the cell membrane. These findings suggest that MSTs play essential roles not only in wheat organ development but also in the perception and response to sugar signaling. Taken together, these results demonstrate that MST genes not only play crucial roles in the development of different wheat organs but also contribute significantly to abiotic stress responses, and are involved in the perception and response to sugar signaling under exogenous sugar treatments. This study provides a valuable foundation for further in-depth investigations into the functional diversification of the MST gene family in wheat.</p>

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Genome-wide identification and expression analysis of the monosaccharide transporter (MST) gene family in response to exogenous sugar in wheat (Triticum aestivum L.)

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Jun Zhang,
  • Bo Zhang,
  • Shuang Zhou,
  • Wenzhong Tian,
  • Rong Zhang,
  • Yiren Chen,
  • Binbin Guo,
  • Chao Ma

摘要

Carbohydrates function as both energy sources and signaling molecules in various critical physiological processes. Monosaccharide transporters (MSTs) are a class of membrane-bound carrier proteins in crops that mediate the transmembrane transport of monosaccharides, thereby playing a central role in crop growth and development, resource allocation, and responses to environmental stimuli. In this study, a total of 200 MST family genes were identified in wheat and categorized into seven subfamilies. Twenty conserved motifs were detected within the TaMST family, with each subfamily exhibiting similar conserved motif patterns. The TaMST gene family was evenly distributed across the three wheat subgenomes, with both segmental and tandem duplications contributing to gene family expansion. The TaMST gene family was found to contain numerous cis-regulatory elements associated with growth and development, hormone signaling, and abiotic stress responses. Expression analysis revealed that most TaMSTs were expressed at low levels in wheat grains, whereas 69, 66, 67, and 64 genes exhibited high expression levels in leaves, buds, roots, and spikes, respectively. Following exogenous sugar treatments, the expression of all TaMSTs in roots was down-regulated, while 4, 2, and 3 genes showed up-regulated expression in leaves after treatment with fructose, glucose, and sucrose, respectively. Subcellular localization analysis demonstrated that TaERD3, TaPMT29, and TaSTP18 were all localized to the cell membrane. These findings suggest that MSTs play essential roles not only in wheat organ development but also in the perception and response to sugar signaling. Taken together, these results demonstrate that MST genes not only play crucial roles in the development of different wheat organs but also contribute significantly to abiotic stress responses, and are involved in the perception and response to sugar signaling under exogenous sugar treatments. This study provides a valuable foundation for further in-depth investigations into the functional diversification of the MST gene family in wheat.