Abstract
Background and aims
It has frequently been shown that plants interact with soils to shape rhizosphere microbiomes. However, previous work has not distinguished between effects of soil properties per se, and effects attributable to the resident microbial communities of those soils. We aimed to test whether differences in the structure of bulk soil microbial communities, within a given soil type, would carry over to impact the structure of the rhizosphere microbial community.
Methods
We used repeated chemical amendments to develop divergent bulk soil microbial community starting points from which rhizosphere development proceeded. Additionally, we contrasted rhizosphere microbiomes associated with two different cultivars of corn (Zea mays).
Results
A wide range of bacterial and archaeal taxa responded to chemical resource amendments, which reduced bulk soil microbiome diversities. Corn genotypes P9714XR and 35F40 had largely similar impacts on rhizosphere microbiome development, although significant differences were evident in select treatments. Notably, in cases where resource amendments altered bulk soil microbial community composition, legacy effects persisted into the rhizosphere.
Conclusions
Our results suggest that rhizosphere microbial communities may develop into different states depending on site history and prior selective events. This work advances our understanding of soil microbiome dynamics and responsiveness to change in the form of simple resource amendments and the development of the rhizosphere.
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Acknowledgments
Shawn Salley provided assistance in locating soils and performed the texture analysis. MGB was supported by a USDA NIFA Postdoctoral Fellowship grant (2011-67012-30938) for a portion of this work. Mention of trade names or commercial products is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. This article was the work of U.S. Government employees engaged in their official duties and is exempt from copyright.
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Bakker, M.G., Chaparro, J.M., Manter, D.K. et al. Impacts of bulk soil microbial community structure on rhizosphere microbiomes of Zea mays . Plant Soil 392, 115–126 (2015). https://doi.org/10.1007/s11104-015-2446-0
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DOI: https://doi.org/10.1007/s11104-015-2446-0