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<p>The soil in the Tianjin Binhai New Area has high salinity and alkalinity due to marine regression and fluvial erosion. Halophytes cope with soil salinization by interacting with root fungi to alter physical and chemical properties of the soil. Although the fungal community in the rhizosphere soil of halophytes plays a crucial role in ecological restoration, the correlation between rhizosphere soil factors and fungi remains unclear. This study aimed to investigate how soil factors in the rhizosphere of halophytes influence the composition and diversity of fungal communities. We examined Four dominant halophyte species in the Tianjin Binhai New Area: <i>Suaeda glauca</i>, <i>Pinellia ternata</i>, <i>Inula japonica</i> and <i>Tamarix chinensis.</i> The key environmental variables affecting the rhizosphere soils of these four test plants included organic carbon (OC), total nitrogen (TN), Alkali-hydrolyzable Nitrogen(AN), Urease (U-SE), pH value, total salt content (TS), and available phosphorus (AP). Fungi isolated from the roots of the four halophytes were characterized using ITS (Internal Transcribed Spacer) gene sequencing technology, resulting in the identification of 26 dark septate endophyte (DSE) strains. Significant interspecific differences in DSE community composition were observed: Suaeda glauca presented the highest DSE richness and diversity, followed by Pinellia ternata and Tamarix chinensis, while Inula japonica presented the lowest DSE richness and diversity. Among the soil factors, pH, total salt content, and AP were significantly positively correlated with DSE diversity. Available phosphorus had the most pronounced effect on DSE community dynamics in saline-alkali soils.</p>

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Available Phosphorus Mediates the Community Structure of Dark Septate Endophytes in Halophytes

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Boda Li,
  • Yilin Luo,
  • Haiyun Ding,
  • Buyu Tian,
  • Lingjie Xu,
  • Yong Zhou

摘要

The soil in the Tianjin Binhai New Area has high salinity and alkalinity due to marine regression and fluvial erosion. Halophytes cope with soil salinization by interacting with root fungi to alter physical and chemical properties of the soil. Although the fungal community in the rhizosphere soil of halophytes plays a crucial role in ecological restoration, the correlation between rhizosphere soil factors and fungi remains unclear. This study aimed to investigate how soil factors in the rhizosphere of halophytes influence the composition and diversity of fungal communities. We examined Four dominant halophyte species in the Tianjin Binhai New Area: Suaeda glauca, Pinellia ternata, Inula japonica and Tamarix chinensis. The key environmental variables affecting the rhizosphere soils of these four test plants included organic carbon (OC), total nitrogen (TN), Alkali-hydrolyzable Nitrogen(AN), Urease (U-SE), pH value, total salt content (TS), and available phosphorus (AP). Fungi isolated from the roots of the four halophytes were characterized using ITS (Internal Transcribed Spacer) gene sequencing technology, resulting in the identification of 26 dark septate endophyte (DSE) strains. Significant interspecific differences in DSE community composition were observed: Suaeda glauca presented the highest DSE richness and diversity, followed by Pinellia ternata and Tamarix chinensis, while Inula japonica presented the lowest DSE richness and diversity. Among the soil factors, pH, total salt content, and AP were significantly positively correlated with DSE diversity. Available phosphorus had the most pronounced effect on DSE community dynamics in saline-alkali soils.