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Meyer KM, Muscettola IE, Vasconcelos ALS, Sherman JK, Metcalf CJE, Lindow SE, Koskella B. Conspecific versus heterospecific transmission shapes host specialization of the phyllosphere microbiome. Cell Host Microbe 2023; 31:2067-2079.e5. [PMID: 38029741 DOI: 10.1016/j.chom.2023.11.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 09/09/2023] [Accepted: 11/01/2023] [Indexed: 12/01/2023]
Abstract
In disease ecology, pathogen transmission among conspecific versus heterospecific hosts is known to shape pathogen specialization and virulence, but we do not yet know if similar effects occur at the microbiome level. We tested this idea by experimentally passaging leaf-associated microbiomes either within conspecific or across heterospecific plant hosts. Although conspecific transmission results in persistent host-filtering effects and more within-microbiome network connections, heterospecific transmission results in weaker host-filtering effects but higher levels of interconnectivity. When transplanted onto novel plants, heterospecific lines are less differentiated by host species than conspecific lines, suggesting a shift toward microbiome generalism. Finally, conspecific lines from tomato exhibit a competitive advantage on tomato hosts against those passaged on bean or pepper, suggesting microbiome-level host specialization. Overall, we find that transmission mode and previous host history shape microbiome diversity, with repeated conspecific transmission driving microbiome specialization and repeated heterospecific transmission promoting microbiome generalism.
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Affiliation(s)
- Kyle M Meyer
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Department of Plant and Microbial Biology, University of California Berkeley, Berkeley, CA 94720, USA.
| | - Isabella E Muscettola
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Ana Luisa S Vasconcelos
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Department of Soil Science, College of Agriculture "Luiz de Queiroz", Universidade de São Paulo, Piracicaba 13418-900, Brazil
| | - Julia K Sherman
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - C Jessica E Metcalf
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA
| | - Steven E Lindow
- Department of Plant and Microbial Biology, University of California Berkeley, Berkeley, CA 94720, USA
| | - Britt Koskella
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Chan Zuckerberg Biohub, San Francisco, San Francisco, CA 94158, USA
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