Oct 29, 2018

Crop residues in wheat-oilseed rape rotation system: a pivotal, shifting platform for microbial meetings

BioRxiv : the Preprint Server for Biology
Lydie KerdraonFrederic Suffert

Abstract

Crop residues are a crucial ecological niche with a major biological impact on agricultural ecosystems. In this study we used a combined diachronic and synchronic field experiment based on wheat-oilseed rape rotations to test the hypothesis that plant is a structuring factor of microbial communities in crop residues, and that this effect decreases over time with their likely progressive degradation and colonization by other microorganisms. We characterized an entire fungal and bacterial community associated with 150 wheat and oilseed rape residue samples at a plurennial scale by metabarcoding. The impact of plant species on the residue microbiota decreased over time and our data revealed turnover, with the replacement of oligotrophs, often plant-specific genera (such as pathogens) by copiotrophs, belonging to more generalist genera. Within a single cropping season, the plant-specific genera and species were gradually replaced by taxa that are likely to originate from the soil. These changes occurred more rapidly for bacteria than for fungi, known to degrade complex compounds. Overall, our findings suggest that crop residues constitute a key fully-fledged microbial ecosystem. Taking into account this ecosystem, that has been neg...Continue Reading

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Mentioned in this Paper

Microorganism
Study
Crops, Agricultural
Complex (molecular entity)
Avian Crop
LUC7L3 gene
Microbiota (Procedure)
Microbial
Disease Management
Fungi

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