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<p>Soil salinization is intensifying globally and poses a serious threat to food security. Halotolerant or halophilic plant growth-promoting bacteria (PGPB) are considered effective biological tools for improving the agricultural productivity of saline soils. In this study, a halotolerant bacterial strain, <i>Enterobacter bugandensis</i> C5-7, was isolated and characterized from the rhizosphere soil of maize cultivated in saline-alkaline soils of a coastal region. Strain C5-7 significantly promoted maize growth under soil salinity of 0.4% (w/w), increasing seedling dry weight by 28.52%, and enhancing root development. To further elucidate the underlying mechanisms, whole-genome sequencing and analysis revealed that C5-7 harbors numerous genes associated with plant growth promotion, including those involved in phosphate solubilization, siderophore production, indole-3-acetic acid (IAA) synthesis, polyamine and volatile organic compound biosynthesis, and colonization of plant tissues. Furthermore, a GFP-tagged C5-7 strain with strong fluorescence was constructed, and colonization assays under salt stress confirmed its endophytic ability in maize tissues. Collectively, these findings enrich the theoretical basis for the role of PGPB in enhancing plant salt tolerance and provide novel microbial resources for sustainable agricultural development.</p>

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Characteristics and genome analysis of Enterobacter bugandensis C5-7 reveal its utilization value of maize growth promotion in saline-alkali land

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Longhao Sun,
  • Tianyang Liu,
  • Shanshan Dai,
  • Xinmin Lei,
  • Ruiqi Liu,
  • Feng Sun,
  • Jing Li,
  • Shanshan Sun,
  • Yanqin Ding

摘要

Soil salinization is intensifying globally and poses a serious threat to food security. Halotolerant or halophilic plant growth-promoting bacteria (PGPB) are considered effective biological tools for improving the agricultural productivity of saline soils. In this study, a halotolerant bacterial strain, Enterobacter bugandensis C5-7, was isolated and characterized from the rhizosphere soil of maize cultivated in saline-alkaline soils of a coastal region. Strain C5-7 significantly promoted maize growth under soil salinity of 0.4% (w/w), increasing seedling dry weight by 28.52%, and enhancing root development. To further elucidate the underlying mechanisms, whole-genome sequencing and analysis revealed that C5-7 harbors numerous genes associated with plant growth promotion, including those involved in phosphate solubilization, siderophore production, indole-3-acetic acid (IAA) synthesis, polyamine and volatile organic compound biosynthesis, and colonization of plant tissues. Furthermore, a GFP-tagged C5-7 strain with strong fluorescence was constructed, and colonization assays under salt stress confirmed its endophytic ability in maize tissues. Collectively, these findings enrich the theoretical basis for the role of PGPB in enhancing plant salt tolerance and provide novel microbial resources for sustainable agricultural development.