Abstract
Background and aims
Cereus jamacaru is a native cactus in the semiarid biome caatinga able to withstand long periods of drought. Here, we studied the rhizosphere microbiome of this cactus to understand how precipitation affects the assembly of bacterial communities from the taxonomical and functional perspectives.
Methods
We selected three C. jamacaru plants in the caatinga biome, sampled the rhizosphere soil from the same plants during rainy and dry seasons and performed shotgun sequencing from total DNA isolated from rhizosphere using Ion Torrent technology.
Results
Acidobacteria, Actinobacteria and Proteobacteria showed increase in relative abundance during the rainy season when compared to dry season. Five major functional groups were significantly different, including differences in amino acids and derivatives, carbohydrates, protein metabolism, respiration, and RNA metabolism. Taxonomically, the assembly of bacterial communities follows a neutral model.
Conclusions
The assembly of bacterial communities in the rhizosphere of C. jamacaru is affected by precipitation resulting in different taxonomical and functional community patterns during dry and rainy seasons. We attribute these differences on rhizosphere communities composition to dispersal limitation of microorganisms caused by low pore connectivity due to low water content in the soil, which leads to spatially isolate communities during the dry season.
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Acknowledgments
This work was funded by Embrapa grant SEG 02.09.01.008.00.00. We thank FAPESP for scholarship support provided to V. N. K. (2013/08144-1, 2014/16041-0), R. G. T. (2010/50799-7, 2013/23470-2) and C. F. (2011/15760-5). The authors also thank João Luiz da Silva and Carlos Alberto Tuão Gava for their help on sampling expeditions in the Caatinga biome and Dr. Ademir Durrer for performing the TAD fitting models. We thank S. R. Cotta for critical reading and valuable suggestions.
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Kavamura, V.N., Taketani, R.G., Ferreira, C. et al. The role of species turnover in structuring bacterial communities in a local scale in the cactus rhizosphere. Plant Soil 425, 101–112 (2018). https://doi.org/10.1007/s11104-018-3570-4
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DOI: https://doi.org/10.1007/s11104-018-3570-4