DOI: 10.31220/agriRxiv.2024.00225

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  Abstract: Abstract Plant parasitic nematodes pose a significant threat to food security. Management strategies for these pathogens are limited, and additional tools for their control are needed. Some fungi have shown promise for biocontrol, however, their success in the field has varied. In contrast, some fungal plant pathogens form synergistic associations with plant parasitic nematodes resulting in increased plant disease severity. However, how both groups of fungi change with different plant parasitic nematode abundances in the soil is underexplored. In this study, we used the soybean cyst nematode as a model to understand these changes. We sampled soil from 171 soybean fields in Ohio in 2019 and 2021 and determined their soybean cyst nematode abundance. We identified the fungi in the samples through amplicon sequencing of the 18s-ITS rDNA regions. Using edaphoclimatic factors, Ohio regions were determined to account for environmental differences. We hypothesized that fungal communities would be influenced by both the samples' region and soybean cyst nematode abundance. K-near neighbor analysis revealed that fungal communities follow regional patterns. We also found that soybean cyst nematode abundance was associated with changes in these communities regardless of the region. Two potential nematophagous fungi were found to be prevalent in Ohio through core community analysis, although they were enriched when soybean cyst nematode abundance was high. Lastly, differential network analysis showed that interactions among fungal community members change when soybean cyst nematode is present in the soil. Together these results suggest that this nematode significantly shifts the fungal community composition in field soils.

  Key words: soybean cyst nematode; abundance; ohio; soil; fungal communities; fung

  Submit time: 10 January 2024

  Copyright: The copyright holder for this preprint is the author/funder, who has granted agriXiv a license to display the preprint in perpetuity.
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