Abstract
Background and aims
Unravelling the factors shaping microbial community structure across plant holobiont is required to promote plant health and crop productivity.
Methods
We compared microbial communities in soils and plant compartments of two contrasting quinoa cultivars, grown in low-input cropping systems along an elevation gradient in northwest Yunnan plateau, China.
Results
With a compartment-dependent effect, alpha-diversity (Shannon and Chao1 indices) of both bacterial and fungal communities generally increased with increasing elevation. Both bacterial and fungal diversities decreased in the order of rhizosphere> root > leaf, but no significant difference was found between two plant genotypes or between bulk soil and rhizosphere. Representing a unique niche for microbial communities, leaf had a much stronger selection effect than root. With insignificant effect of plant genotype, local environmental filtering (i.e. climate, edaphic and plant traits) could have played an important role in structuring soil microbial communities, but they were weak for root and leaf endophytes, except for root fungi. The relative importance of stochastic and deterministic processes in bacterial or fungal communities varied with the elevational scale, showing contrasting patterns within each plant-associated compartment, except for leaf (determinism).
Conclusions
The revealed distinct drives in determining the community assembly in quinoa-associated microbes are thought to be essential for underpinning plant–microbe interactions.
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Acknowledgements
We thank the Public Technology Service Center of Xishuangbanna Tropical Botanical Garden for the soil physico-chemical measurements, Hongchun Fan and Chun Wang for their data analysis, and Yongjian Liu and Bin Zhang for their comments on the early draft. I also would like to thank Ioannis Stringlis, Gilles Vismans, and another three anonymous reviewers who helped to improve this paper substantially. This work was supported by the grants from the National Natural Science Foundation of China (31670686) and the ‘135’ Program of Chinese Academy of Sciences (2017XTBG-T02).
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Cai, Z., Wang, X., Bhadra, S. et al. Distinct factors drive the assembly of quinoa-associated microbiomes along elevation. Plant Soil 448, 55–69 (2020). https://doi.org/10.1007/s11104-019-04387-1
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DOI: https://doi.org/10.1007/s11104-019-04387-1