A full-length SSU rRNA-based workflow for high-resolution monitoring of nematode communities reveals direct and indirect responses to plant-based manipulations

Activity: Talk or presentationOral presentationAcademic

Description

Agricultural intensification has resulted in a decline of soil biodiversity, prompting the development of measures to restore soil life. Due to the overwhelming biodiversity of soils, evaluating such measures is not straightforward, and proxies are used to assess soil health. Because of their trophic diversity, high abundance, and relatively well-characterized ecologies, nematodes are often used as soil health indicators. However, the scarcity of informative morphological characters hampers the upscaling of this proxy. Here we present a community analysis approach that uses nanopore sequencing to generate full-length 18S sequences. We mapped the effects of ten cover crops on nematode communities in a field experiment. 132 samples were analysed, and 65 nematode taxa were detected, mostly at species level, including representatives of all trophic groups. As a validation, all samples were analysed microscopically for M. chitwoodi, and comparison of count and molecular data revealed highly similar results. Treatments did not only affect plant-parasitic nematodes, but also free-living nematodes in a cover crop-specific manner. Free-living nematodes from the same trophic group, and even congeneric species, responded differentially to plant-mediated manipulations of the soil microbiome. Hence, nanopore-based 18S sequencing could facilitate a substantial refinement of the use of nematodes as indicators for soil health.
Period12 Oct 2023
Event titleVirtual Nematology Conference 2023
Event typeConference
Degree of RecognitionInternational