Pedosphere 35(2): 352--363, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Promotion of symbiotic interaction between phagotrophic protists and beneficial bacteria, mediated via balancing of soil nutrients, reduces the incidence of watermelon Fusarium wilt |
Yaoyao TONG1,2,3, Li WANG1,2, Chuanfa WU1,2, Haoqing ZHANG1,2, Yangwu DENG3, Ming CHEN3, Xianqing ZHENG4, Weiguang LÜ4, Jianping CHEN1,2, Tida GE1,2 |
1 State Key Laboratory for Quality and Safety of Agro-Products, International Science and Technology Cooperation Base for the Regulation of Soil Biological Functions and One Health of Zhejiang Province, Ningbo University, Ningbo 315211 (China)
2 Key Laboratory of Biotechnology in Plant Protection of MARA and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211 (China)
3 Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000 (China)
4 Eco-environmental Protection Institute of Shanghai Academy of Agricultural Sciences, Shanghai 201403 (China) |
| ABSTRACT |
| Elucidating the microbial mechanisms that trigger Fusarium wilt represents a key step in addressing the barriers to sustainable cropping. However, from the perspective of the complete microbiome, the integrated role of soil nutrients and microbial community in the fields with different rates of wilt disease remains unclear. In this study, we examined the potential interrelationships among the nutrients, bacteria, fungi, and protists in rhizospheric soils collected from the fields with watermelon cropping for 7 years at the Zhuanghang Experimental Station of Shanghai Academy of Agricultural Sciences, China. The soils collected were characterized by a high (HW, 81.25%) or low (LW, 6.25%) wilting rate. The HW soil was found to contain a higher abundance of Fusarium oxysporum (1.30-fold higher) than the LW soil, along with higher contents of available phosphorus (1.31-fold higher) and available potassium (2.39-fold higher). In addition, the interkingdom correlation between protists and bacteria in the HW soil was 2.08-fold higher than that in the LW soil. Furthermore, structural equation modeling revealed that an excess of soil available potassium enhanced the predation by potentially detrimental phagotrophic protists on potentially beneficial bacteria. In summary, our findings indicated that a balanced nutrient input and the interactions between protists (Cercomonas and Colpoda) and beneficial bacteria (Bacillus) played important roles in controlling the incidence of watermelon Fusarium wilt. |
| Key Words: continuous cropping,co-occurrence network,Fusarium oxysporum,microbial community,nitrogen limitation,soil-borne pathogen |
| Citation: Tong Y Y, Wang L, Wu C F, Zhang H Q, Deng Y W, Chen M, Zheng X Q, Lü W G, Chen J P, Ge T D. 2025. Promotion of symbiotic interaction between phagotrophic protists and beneficial bacteria, mediated via balancing of soil nutrients, reduces the incidence of watermelon Fusarium wilt. Pedosphere. 35(2): 352-363. |
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