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Purpose <p>The survival strategies of <i>Myricaria laxiflora</i> in nutrient-poor riparian ecosystems remain poorly understood, particularly regarding its capacity to form monodominant communities through plant-microbe interactions.</p> Methods <p>Here we used high-throughput 16S rRNA sequencing and soil physicochemical analysis, and investigated the fertile island effect and rhizosphere bacterial dynamics of <i>M. laxiflora</i> on the sandbars in the Yangtze River. We examined soil physicochemical properties and bacterial communities across three microhabitats: under the canopy center, the bare area, and the rhizosphere soil.</p> Results <p>We revealed significantly higher total organic carbon and total nitrogen in the canopy soil compared to the bare area, confirming the formation of fertile islands. We found that rhizosphere soil exhibited distinct bacterial richness and diversity, dominated by Proteobacteria, with specific functional roles in nitrogen fixation and organic matter degradation. Co-occurrence network analysis demonstrated reduced complexity but intensified mutualistic interactions in rhizosphere communities, suggesting a plant-driven selection for functionally specialized communities.</p> Conclusions <p>Our findings indicate that <i>M. laxiflora</i> could actively shape the rhizosphere microbiome to enhance nutrient acquisition and sustain monodominance, providing novel insights into plant-microbe interaction in nutrient-poor habitats. Our results inform appropriate restoration strategies for riparian ecosystems facing nutrient limitations.</p>

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Adaptation of Myricaria Laxiflora in Nutrient-poor Sandbars of the Yangtze River: Interplay Between Rhizosphere Microbiome and Fertile Island Effect

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Xinyi Xie,
  • Zhichao Ye,
  • Kun Lv,
  • Yu Wu,
  • Chuanhua Wang,
  • Yanhong Xue,
  • Jinrong Liu

摘要

Purpose

The survival strategies of Myricaria laxiflora in nutrient-poor riparian ecosystems remain poorly understood, particularly regarding its capacity to form monodominant communities through plant-microbe interactions.

Methods

Here we used high-throughput 16S rRNA sequencing and soil physicochemical analysis, and investigated the fertile island effect and rhizosphere bacterial dynamics of M. laxiflora on the sandbars in the Yangtze River. We examined soil physicochemical properties and bacterial communities across three microhabitats: under the canopy center, the bare area, and the rhizosphere soil.

Results

We revealed significantly higher total organic carbon and total nitrogen in the canopy soil compared to the bare area, confirming the formation of fertile islands. We found that rhizosphere soil exhibited distinct bacterial richness and diversity, dominated by Proteobacteria, with specific functional roles in nitrogen fixation and organic matter degradation. Co-occurrence network analysis demonstrated reduced complexity but intensified mutualistic interactions in rhizosphere communities, suggesting a plant-driven selection for functionally specialized communities.

Conclusions

Our findings indicate that M. laxiflora could actively shape the rhizosphere microbiome to enhance nutrient acquisition and sustain monodominance, providing novel insights into plant-microbe interaction in nutrient-poor habitats. Our results inform appropriate restoration strategies for riparian ecosystems facing nutrient limitations.