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<p>Potato late blight, caused by the oomycete <i>Phytophthora infestans</i>, poses a significant threat to global potato production. This study investigates the interplay between cadmium (Cd) stress and late blight incidence in the karst region of southwestern China, an area characterized by significant heavy metal contamination and over 102,000 hectares of potato cultivation. Using Illumina MiSeq sequencing, we analyzed the rhizosphere bacterial and fungal communities of both late blight-infected and healthy potato plants across a gradient of soil Cd concentrations (1.0 to 4.5&#xa0;mg·kg<sup>−1</sup>). Our results demonstrated a higher number of operational taxonomic units in diseased plants. Bacterial alpha diversity peaked at 2.5&#xa0;mg·kg<sup>−1</sup> before declining, whereas fungal diversity increased continuously with Cd concentration. Notably, the relative abundance of key pathogen-antagonistic microorganisms, including <i>Flavobacterium</i>, <i>Pseudomonas</i>, and <i>Aspergillus</i>, was reduced in diseased plants. Principal coordinate analysis revealed a clear separation of microbial communities between health states. Our results demonstrate that Cd stress dysregulates the rhizosphere microbiome, suppressing beneficial taxa and ultimately predisposing potatoes to late blight in karst agroecosystems.</p>

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Cadmium-Induced Microbiome Dysbiosis Promotes Potato Late Blight in Karst Soils

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Chunyan Li,
  • Hongyan Liu,
  • Xulian Wang,
  • Rui Zhang,
  • Hai Zhang,
  • Zicheng Gu

摘要

Potato late blight, caused by the oomycete Phytophthora infestans, poses a significant threat to global potato production. This study investigates the interplay between cadmium (Cd) stress and late blight incidence in the karst region of southwestern China, an area characterized by significant heavy metal contamination and over 102,000 hectares of potato cultivation. Using Illumina MiSeq sequencing, we analyzed the rhizosphere bacterial and fungal communities of both late blight-infected and healthy potato plants across a gradient of soil Cd concentrations (1.0 to 4.5 mg·kg−1). Our results demonstrated a higher number of operational taxonomic units in diseased plants. Bacterial alpha diversity peaked at 2.5 mg·kg−1 before declining, whereas fungal diversity increased continuously with Cd concentration. Notably, the relative abundance of key pathogen-antagonistic microorganisms, including Flavobacterium, Pseudomonas, and Aspergillus, was reduced in diseased plants. Principal coordinate analysis revealed a clear separation of microbial communities between health states. Our results demonstrate that Cd stress dysregulates the rhizosphere microbiome, suppressing beneficial taxa and ultimately predisposing potatoes to late blight in karst agroecosystems.