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Shift in the rhizosphere soil fungal community associated with root rot infection of Plukenetia volubilis Linneo caused by Fusarium and Rhizopus species

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Abstract

Background

Plukenetia volubilis Linneo is an oleaginous plant belonging to the family Euphorbiaceae. Due to its seeds containing a high content of edible oil and rich in vitamins, P. volubilis is cultivated as an economical plant worldwide. However, the cultivation and growth of P. volubilis is challenged by phytopathogen invasion leading to production loss.

Methods

In the current study, we tested the pathogenicity of fungal pathogens isolated from root rot infected P. volubilis plant tissues by inoculating them into healthy P. volubilis seedlings. Metagenomic sequencing was used to assess the shift in the fungal community of P. volubilis rhizosphere soil after root rot infection.

Results

Four Fusarium isolates and two Rhizopus isolates were found to be root rot causative agents of P. volubilis as they induced typical root rot symptoms in healthy seedlings. The metagenomic sequencing data showed that root rot infection altered the rhizosphere fungal community. In root rot infected soil, the richness and diversity indices increased or decreased depending on pathogens. The four most abundant phyla across all samples were Ascomycota, Glomeromycota, Basidiomycota, and Mortierellomycota. In infected soil, the relative abundance of each phylum increased or decreased depending on the pathogen and functional taxonomic classification.

Conclusions

Based on our results, we concluded that Fusarium and Rhizopus species cause root rot infection of P. volubilis. In root rot infected P. volubilis, the shift in the rhizosphere fungal community was pathogen-dependent. These findings may serve as a key point for a future study on the biocontrol of root rot of P. volubilis.

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Data availability

The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found in the article/Supplementary Material.

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Authors and Affiliations

Authors

Contributions

CU: Designed and performed the experiments, analyzed the data, and wrote the manuscript. WB, LS and XZ: Performed the experiments. BGD: Data analysis, Writing—review and editing. SM: Data analysis, Writing—review and editing. SX: Seeds and soil provision. XY: Conceptualization and design, Project coordinator, Supervisor, Funding acquisition.

Corresponding authors

Correspondence to Constantine Uwaremwe or Xiaodong Yang.

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Conflict of interest

The authors declare no competing interests.

Funding

This research was funded by the National Natural Science Foundation of China (NSFC) (Grant no. 42061144005 and 41877064).

Additional information

I, Constantine Uwaremwe, declare that the submitted research paper is my original work and no part of it has been published anywhere else in the past.

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Uwaremwe, C., Bao, W., Daoura, B.G. et al. Shift in the rhizosphere soil fungal community associated with root rot infection of Plukenetia volubilis Linneo caused by Fusarium and Rhizopus species. Int Microbiol (2023). https://doi.org/10.1007/s10123-023-00470-x

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  • DOI: https://doi.org/10.1007/s10123-023-00470-x

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