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<p>Specific plant growth-promoting rhizobacteria (PGPR) can selectively enhance plant growth and soil health by reshaping the rhizosphere microbial community in a soil-dependent manner. This study aimed to evaluate the effects of two <i>Stutzerimonas stutzeri</i> PGPR strains (NRCB010 and NRCB025) on alfalfa growth in two different soil types, in order to identify effective PGPR candidates for improving plant growth and soil health. Inoculation tests were conducted to evaluate the impacts of <i>S. stutzeri</i> NRCB010 and NRCB025 on alfalfa. The growth traits of alfalfa, nutrient contents of rhizosphere soil, and rhizosphere microbial community composition were measured and analyzed under two soil conditions (Yixing soil and Nanjing soil). Inoculation with both PGPR strains significantly enhanced alfalfa growth, with dry weight increases of 17.5% and 14.3% in Yixing soil and 56.2% and 91.0% in Nanjing soil, respectively. Soil nutrient contents (particularly soil organic matter, ammonium nitrogen, and exchangeable calcium) were significantly improved in a soil-dependent manner. The rhizosphere microbial community was reshaped, with increased beneficial genera such as <i>Streptomyces</i> in Yixing soil and <i>Actinoplanes</i> in Nanjing soil, and decreased genera including <i>Sphingomonas</i> and <i>Xanthomonas</i>. Strong correlations were observed between these microbial shifts, nutrient availability, and plant growth. The PGPR strains NRCB010 and NRCB025 effectively promote alfalfa growth by enhancing soil nutrient content and modulating the rhizosphere microbiome in a soil-specific manner. These results confirm that soil-adapted beneficial rhizobacteria enhance plant productivity by restructuring the rhizosphere microbial community and modulating nutrient cycling processes. These findings provide a scientific basis for the targeted use of PGPR to improve alfalfa productivity and optimize soil microecological conditions in different agricultural environments.</p>

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Stutzerimonas stutzeri Inoculation Promotes Alfalfa Growth by Improving Soil Nutrients and Restructuring the Rhizosphere Microbiome

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Huanhuan Zhang,
  • Shangbo Yan,
  • Xinyuan Tang,
  • Wenshi Wu,
  • Weishou Shen,
  • Nan Gao

摘要

Specific plant growth-promoting rhizobacteria (PGPR) can selectively enhance plant growth and soil health by reshaping the rhizosphere microbial community in a soil-dependent manner. This study aimed to evaluate the effects of two Stutzerimonas stutzeri PGPR strains (NRCB010 and NRCB025) on alfalfa growth in two different soil types, in order to identify effective PGPR candidates for improving plant growth and soil health. Inoculation tests were conducted to evaluate the impacts of S. stutzeri NRCB010 and NRCB025 on alfalfa. The growth traits of alfalfa, nutrient contents of rhizosphere soil, and rhizosphere microbial community composition were measured and analyzed under two soil conditions (Yixing soil and Nanjing soil). Inoculation with both PGPR strains significantly enhanced alfalfa growth, with dry weight increases of 17.5% and 14.3% in Yixing soil and 56.2% and 91.0% in Nanjing soil, respectively. Soil nutrient contents (particularly soil organic matter, ammonium nitrogen, and exchangeable calcium) were significantly improved in a soil-dependent manner. The rhizosphere microbial community was reshaped, with increased beneficial genera such as Streptomyces in Yixing soil and Actinoplanes in Nanjing soil, and decreased genera including Sphingomonas and Xanthomonas. Strong correlations were observed between these microbial shifts, nutrient availability, and plant growth. The PGPR strains NRCB010 and NRCB025 effectively promote alfalfa growth by enhancing soil nutrient content and modulating the rhizosphere microbiome in a soil-specific manner. These results confirm that soil-adapted beneficial rhizobacteria enhance plant productivity by restructuring the rhizosphere microbial community and modulating nutrient cycling processes. These findings provide a scientific basis for the targeted use of PGPR to improve alfalfa productivity and optimize soil microecological conditions in different agricultural environments.