Abstract
Background and aims
Root rot is a catastrophic disease of perennial medicinal plants which could be caused by various soil-borne fungal pathogens. However, the understanding of the composition and diversity of root rot pathogenic fungi, their successions and potential drivers remains limited.
Methods
Sanqi ginseng (Panax notoginseng) was selected as a model plant and the rhizosphere soils of root rot-infected Sanqi ginseng at different growth years were collected. Phenolic acid content, pathogen abundance, and fungal microbiota were examined by using the high-performance liquid chromatography (HPLC), real-time PCR and Miseq sequencing.
Results
Pathogenic agents dominated in the rhizospheric fungal microbiota of rotten Sanqi ginseng and mainly comprised of Ilyonectria, Plectosphaerella, Clonostachys, Gibberella, Pestalotiopsis, Fusarium, and Chalara, with Ilyonectria and Fusarium being most abundant. The composition of pathogenic microbiota, but not α-diversity indices, changed considerably with Sanqi ginseng growth. The shifts of phenolic acid profile were an important driver in changes of rhizosphere pathogenic microbiota, and same phenolic acid exerted distinct functions on differential pathogenic taxa. Particularly, the contents of p-coumaric acid, ferulic acid, and benzoic acid were positively correlated with the abundance of genus Fusarium and negatively correlated with the abundance of genus Ilyonectria.
Conclusions
Root rot-infected Sanqi ginseng rhizosphere harbors dynamically pathogenic microbiota driven by the shift of phenolic acids. This study provides insights into the composition, variation, and driver of root rot pathogenic microbiota; these insights are important for the development of targeted measure for the prevention and control of root rot diseases.
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Acknowledgements
We also would like to thank the staffs in Miaoxiang Sanqi Technology Co., Ltd. for managing the field experiment and providing the convenience for sample collection.
Funding
This study was financially supported by the National Natural Science Foundation of China (42077031, 41701277), the China Postdoctoral Science Foundation (2018 M630573, 2019 T120442), the Reserve Talent Project of Young and Middle-aged Academic and Technical Leaders of Yunnan Province (202005 AC160043), and the Opening Project of Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control (NUEORS202002).
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JZ, XQH, and ZCC conceived and designed research. BYW, QX, and YLL conducted experiments. BYW and JZ analyzed data and wrote the manuscript. JBZ, SZY, and FGW commented the manuscript. All authors read and approved the manuscript.
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Wang, B., Xia, Q., Li, Y. et al. Root rot-infected Sanqi ginseng rhizosphere harbors dynamically pathogenic microbiotas driven by the shift of phenolic acids. Plant Soil 465, 385–402 (2021). https://doi.org/10.1007/s11104-021-05034-4
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DOI: https://doi.org/10.1007/s11104-021-05034-4