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Soil potassium is correlated with root secondary metabolites and root-associated core bacteria in licorice of different ages

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Abstract

Aims

Licorice (Glycyrrhiza uralensis Fisch.) is a crucial medicinal herb as it accumulates glycyrrhizin and liquiritin in roots. Licorice root-associated bacterial communities shaped by soil characteristics are supposed to regulate the accumulation of root secondary metabolites.

Methods

The soil characteristics, root secondary metabolites, and root-associated bacterial communities were analyzed in licorice plants of different ages to explore their temporal dynamics and interaction mechanisms.

Results

Temporal variation in soil characteristics and root secondary metabolites was distinct. The alpha-diversity of root-associated bacterial communities decreased with root proximity, and the community composition was clustered in the rhizosphere. Different taxa that were core-enriched from the dominant taxa in the bulk soil, rhizosphere soil, and root endosphere displayed varied time–decay relationships. Soil total potassium (TK) as a key factor regulated the temporal variation in some individual taxa in the bulk and rhizosphere soils; these taxa were associated with the adjustment of root secondary metabolites across different TK levels.

Conclusions

Licorice specifically selects root-associated core bacteria over the course of plant development, and TK is correlated with root secondary metabolites and individual core-enriched taxa in the bulk and rhizosphere soils, which may have implications for practical licorice cultivation.

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Acknowledgments

We thank Xiaowu Yan and Ming Li for assistance in soil sampling. We also thank the anonymous reviewers for comments on the manuscript. This work was funded by the National Natural Science Foundation of China (No. 41830755 and 41807030).

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Authors and Affiliations

  1. State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, 3 Taicheng Road, Yangling, Shaanxi, 712100, People’s Republic of China

    Yang Liu, Yanmei Li, Wen Luo, Shuang Liu, Weimin Chen, Chun Chen, Shuo Jiao & Gehong Wei

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  1. Yang Liu
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  2. Yanmei Li
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  3. Wen Luo
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Liu, Y., Li, Y., Luo, W. et al. Soil potassium is correlated with root secondary metabolites and root-associated core bacteria in licorice of different ages. Plant Soil 456, 61–79 (2020). https://doi.org/10.1007/s11104-020-04692-0

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