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<p>Soil salinization is a major constraint to global agricultural productivity, necessitating sustainable solutions to enhance crop salt tolerance. In this study, we evaluated the potential of <i>Vreelandella titanicae</i> strain GPM3, an epiphytic bacterium isolated from the red alga <i>Pyropia yezoensis</i>, to improve plant performance under saline conditions. Whole-genome sequencing revealed a 5,695,972&#xa0;bp circular chromosome harboring genes involved in sulfur metabolism, nitrogen assimilation, phosphate transport, oxidative stress responses, and ion transport. Phylogenetic analysis placed GPM3 within the <i>Halomonadaceae</i> family, whose members are adapted to saline environments. GPM3 was tested for its ability to confer salt tolerance in <i>Arabidopsis</i> grown under increasing NaCl concentrations. Inoculated plants showed significantly greater biomass, chlorophyll retention, and reduced sodium accumulation compared with non-inoculated controls, particularly at higher salinity. qPCR analysis further revealed that GPM3 treatment primed ABA-responsive transcription factors (<i>MYB15</i>, <i>WRKY70</i>), enhanced SA signaling (<i>ICS1</i>, <i>PR1</i>), and upregulated ROS-regulating genes (<i>CAT2</i>, <i>RBOHB</i>) under salt stress, while attenuating the induction of certain JA pathway genes (<i>JAZ9</i>, <i>LOX2</i>, <i>PDF1.2</i>). These results indicate that GPM3 enhances salt tolerance in <i>Arabidopsis</i> through multiple physiological and transcriptional responses. This study supports the potential application of GPM3 as a bioinoculant for saline agriculture and provides a basis for further mechanistic research.</p>

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Enhancing Plant Salt Tolerance with Vreelandella Titanicae Strain GPM3, an Epiphytic Bacterium Isolated from Pyropia Yezoensis

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Sung Hee Jo,
  • Chi Eun Hong,
  • Jeong Mee Park,
  • Ryoung Shin

摘要

Soil salinization is a major constraint to global agricultural productivity, necessitating sustainable solutions to enhance crop salt tolerance. In this study, we evaluated the potential of Vreelandella titanicae strain GPM3, an epiphytic bacterium isolated from the red alga Pyropia yezoensis, to improve plant performance under saline conditions. Whole-genome sequencing revealed a 5,695,972 bp circular chromosome harboring genes involved in sulfur metabolism, nitrogen assimilation, phosphate transport, oxidative stress responses, and ion transport. Phylogenetic analysis placed GPM3 within the Halomonadaceae family, whose members are adapted to saline environments. GPM3 was tested for its ability to confer salt tolerance in Arabidopsis grown under increasing NaCl concentrations. Inoculated plants showed significantly greater biomass, chlorophyll retention, and reduced sodium accumulation compared with non-inoculated controls, particularly at higher salinity. qPCR analysis further revealed that GPM3 treatment primed ABA-responsive transcription factors (MYB15, WRKY70), enhanced SA signaling (ICS1, PR1), and upregulated ROS-regulating genes (CAT2, RBOHB) under salt stress, while attenuating the induction of certain JA pathway genes (JAZ9, LOX2, PDF1.2). These results indicate that GPM3 enhances salt tolerance in Arabidopsis through multiple physiological and transcriptional responses. This study supports the potential application of GPM3 as a bioinoculant for saline agriculture and provides a basis for further mechanistic research.