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Transmission of Seed and Soil Microbiota to Seedling

Abstract : The seed microbial community constitutes an initial inoculum for plant microbiota assembly. Still, the persistence of seed microbiota when seeds encounter soil during plant emergence and early growth is barely documented. We characterized the encounter event of seed and soil microbiota and how it structured seedling bacterial and fungal communities by using amplicon sequencing. We performed eight contrasting encounter events to identify drivers influencing seedling microbiota assembly. To do so, four contrasting seed lots of two Brassica napus genotypes were sown in two soils whose microbial diversity levels were manipulated by serial dilution and recolonization. Seedling root and stem microbiota were influenced by soil but not by initial seed microbiota composition or by plant genotype. A strong selection on the seed and soil communities occurred during microbiota assembly, with only 8% to 32% of soil taxa and 0.8% to 1.4% of seed-borne taxa colonizing seedlings. The recruitment of seedling microbiota came mainly from soil (35% to 72% of diversity) and not from seeds (0.3% to 15%). Soil microbiota transmission success was higher for the bacterial community than for the fungal community. Interestingly, seedling microbiota was primarily composed of initially rare taxa (from seed, soil, or unknown origin) and intermediate-abundance soil taxa.
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Contributor : Matthieu Barret <>
Submitted on : Monday, July 26, 2021 - 2:24:15 PM
Last modification on : Tuesday, August 3, 2021 - 12:09:46 PM


Distributed under a Creative Commons Attribution 4.0 International License

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Aude Rochefort, Marie Simonin, Coralie Marais, Anne-Yvonne Guillerm-Erckelboudt, Matthieu Barret, et al.. Transmission of Seed and Soil Microbiota to Seedling. mSystems, 2021, 6 (3), pp.00446-21. ⟨10.1128/msystems.00446-21⟩. ⟨hal-03299428⟩



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