Abstract
Background and aims
Seeds are involved in the transmission of microorganisms from one plant generation to another and consequently may act as the initial inoculum source for the plant microbiota. In this work, we assessed the structure and composition of the seed microbiota of radish (Raphanus sativus) across three successive plant generations.
Methods
Structure of seed microbial communities were estimated on individual plants through amplification and sequencing of genes that are markers of taxonomic diversity for bacteria (gyrB) and fungi (ITS1). The relative contribution of dispersal and ecological drift in inter-individual fluctuations were estimated with a neutral community model.
Results
Seed microbial communities of radish display a low heritability across plant generations. Fluctuations in microbial community profiles were related to changes in community membership and composition across plant generations, but also to variation between individual plants. Ecological drift was an important driver of the structure of seed bacterial communities, while dispersal was involved in the assembly of the fungal fraction of the seed microbiota.
Conclusions
These results provide a first glimpse of the governing processes driving the assembly of the seed microbiota.
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Acknowledgements
This research was supported by grant awarded by the Region des Pays de la Loire (metaSEED, 2013 10080) and the Michigan State University Plant Resilience Institute. The authors wish to thanks Gloria Torres-Cortes for manuscript assessment, Emmanuelle Laurent, Julie Gombert and Vincent Odeau (Fédération Nationale des Agriculteurs Multiplicateurs de Semences - FNAMS) for their help with all the field experiments, Aude Rochefort for the preparation of the sequencing library and Muriel Bahut from the platform ANAN of SFR Quasav for launching the MiSeq runs.
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Rezki, S., Campion, C., Simoneau, P. et al. Assembly of seed-associated microbial communities within and across successive plant generations. Plant Soil 422, 67–79 (2018). https://doi.org/10.1007/s11104-017-3451-2
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DOI: https://doi.org/10.1007/s11104-017-3451-2