Predatory protists reduce bacteria wilt disease incidence in tomato plants

Sai Guo, Zixuan Jiao, Zhiguang Yan, Xinyue Yan, Xuhui Deng, Wu Xiong, Chengyuan Tao, Hongjun Liu, Rong Li* (Corresponding author), Qirong Shen, George A. Kowalchuk, Stefan Geisen

*Corresponding author for this work

Research output: Contribution to journal/periodicalArticleScientificpeer-review

Abstract

Soil organisms are affected by the presence of predatory protists. However, it remains poorly understood how predatory protists can affect plant disease incidence and how fertilization regimes can affect these interactions. Here, we characterise the rhizosphere bacteria, fungi and protists over eleven growing seasons of tomato planting under three fertilization regimes, i.e conventional, organic and bioorganic, and with different bacterial wilt disease incidence levels. We find that predatory protists are negatively associated with disease incidence, especially two ciliophoran Colpoda OTUs, and that bioorganic fertilization enhances the abundance of predatory protists. In glasshouse experiments we find that the predatory protist Colpoda influences disease incidence by directly consuming pathogens and indirectly increasing the presence of pathogen-suppressive microorganisms in the soil. Together, we demonstrate that predatory protists reduce bacterial wilt disease incidence in tomato plants via direct and indirect reductions of pathogens. Our study provides insights on the role that predatory protists play in plant disease, which could be used to design more sustainable agricultural practices.
Original languageEnglish
Article number829 (2024)
JournalNature Communications
Volume15
DOIs
Publication statusPublished - 27 Jan 2024

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