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Fertilization shapes a well-organized community of bacterial decomposers for accelerated paddy straw degradation

Lookup NU author(s): Dr Evangelos Petropoulos

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2018 The Author(s). Straw, mainly dry stalks of crops, is an agricultural byproduct. Its incorporation to soils via microbial redistribution is an environment-friendly way to increase fertility. Fertilization influences soil microorganisms and straw degradation. However, our up to date knowledge on the responses of the straw decomposers to fertilization remains elusive. To this end, inoculated with paddy soils with 26-year applications of chemical fertilizers, organic amendments or controls without fertilization, microcosms were anoxically incubated with 13C-labelled rice straw amendment. DNA-based stable isotope probing and molecular ecological network analysis were conducted to unravel how straw degrading bacterial species shift in responses to fertilizations, as well as evaluate what their roles/links in the microbiome are. It was found that only a small percentage of the community ecotypes was participating into straw degradation under both fertilizations. Fertilization, especially with organic amendments decreased the predominance of Firmicutes- and Acidobacteria-like straw decomposers but increased those of the copiotrophs, such as β-Proteobacteria and Bacteroidetes due to increased soil fertility. For the same reason, fertilization shifted the hub species towards those of high degrading potential and created a more stable and efficient microbial consortium. These findings indicate that fertilization shapes a well-organized community of decomposers for accelerated straw degradation.


Publication metadata

Author(s): Zhan Y, Liu W, Bao Y, Zhang J, Petropoulos E, Li Z, Lin X, Feng Y

Publication type: Article

Publication status: Published

Journal: Scientific Reports

Year: 2018

Volume: 8

Issue: 1

Online publication date: 22/05/2018

Acceptance date: 02/05/2018

Date deposited: 12/06/2018

ISSN (print): 2045-2322

Publisher: Nature Publishing Group

URL: https://doi.org/10.1038/s41598-018-26375-8

DOI: 10.1038/s41598-018-26375-8


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