Inorganic Nitrogen Application Affects Both Taxonomical and Predicted Functional Structure of Wheat Rhizosphere Bacterial Communities

A - Papers appearing in refereed journals

Nessner-Kavamura-Noguchi, V., Hayat, R., Clark, I. M., Rossmann, M., Mendes, R., Hirsch, P. R. and Mauchline, T. H. 2018. Inorganic Nitrogen Application Affects Both Taxonomical and Predicted Functional Structure of Wheat Rhizosphere Bacterial Communities. Frontiers in Microbiology. 9, p. 1074.

AuthorsNessner-Kavamura-Noguchi, V., Hayat, R., Clark, I. M., Rossmann, M., Mendes, R., Hirsch, P. R. and Mauchline, T. H.
Abstract

The effects of fertilizer regime on bulk soil microbial communities have been well studied, but this is not the case for the rhizosphere microbiome. The aim of this work was to assess the impact of fertilization regime on wheat rhizosphere microbiome assembly and 16S rRNA gene-predicted functions with soil from the long term Broadbalk experiment at Rothamsted Research. Soil from four N fertilization regimes (organic N, zero N, medium inorganic N and high inorganic N) was sown with seeds of Triticum aestivum cv. Cadenza. 16S rRNA gene amplicon sequencing was performed with the Illumina platform on bulk soil and rhizosphere samples of 4-week-old and flowering plants (10 weeks). Phylogenetic and 16S rRNA gene-predicted functional analyses were performed. Fertilization regime affected the structure and composition of wheat rhizosphere bacterial communities. Acidobacteria and Planctomycetes were significantly depleted in treatments receiving inorganic N, whereas the addition of high levels of inorganic N enriched members of the phylum Bacteroidetes, especially after 10 weeks. Bacterial richness and diversity decreased with inorganic nitrogen inputs and was highest after organic treatment (FYM). In general, high levels of inorganic nitrogen fertilizers negatively affect bacterial richness and diversity, leading to a less stable bacterial community structure over time, whereas, more stable bacterial communities are provided by organic amendments. 16S rRNA gene-predicted functional structure was more affected by growth stage than by fertilizer treatment, although, some functions related to energy metabolism and metabolism of terpenoids and polyketides were enriched in samples not receiving any inorganic N, whereas inorganic N addition enriched predicted functions related to metabolism of other amino acids and carbohydrates. Understanding the impact of different fertilizers on the structure and dynamics of the rhizosphere microbiome is an important step toward developing strategies for production of crops in a sustainable way.

KeywordsWheat; Rhizosphere; Bacterial communities; Fertilizer; Functional diversity; Sustainable intensification
Year of Publication2018
JournalFrontiers in Microbiology
Journal citation9, p. 1074
Digital Object Identifier (DOI)doi:10.3389/fmicb.2018.01074
Open accessPublished as ‘gold’ (paid) open access
FunderBBSRC Newton funding
Funder project or codeBBSRC Embrapa - Understanding the importance of the wheat root microbiome for sustainable crop production.
ASSIST - Achieving Sustainable Agricultural Systems
S2N - Soil to Nutrition - Work package 1 (WP1) - Optimising nutrient flows and pools in the soil-plant-biota system
Optimisation of nutrients in soil-plant systems: How can we control nitrogen cycling in soil?
Accepted author manuscript
Output statusPublished
Publication dates
Online29 May 2018
Publication process dates
Accepted04 May 2018
PublisherFrontiers Media SA
Copyright licenseCC BY
ISSN1664-302X

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