Abstract
Despite rapid progress in plant–microbe interaction research within terrestrial environments, our knowledge of aquatic plant and macroalgae microbiome structure, function, and ecology remains scarce, even though these hosts are key players in structuring the lacustrine environments. Here, we used the co-occurring, fast-growing hosts Hydrilla verticillata (Hydrocharitaceae) and Cladophora spp. (Chlorophyta), which dominate the littoral zones of a nitrogen-limited, hard-water lake, Lake Atitlán (Guatemala). The aim of this study was: (1) to assess the structure of Hydrilla phyllosphere-associated and Cladophora filament-associated bacterial and fungal assemblages in the context of host specificity; (2) to predict microbial potential to contribute to biogeochemical cycling in the lake littoral; and (3) to compare the aquatic microbiome structure to available datasets from terrestrial ecosystems, using next-generation amplicon sequencing, co-occurrence network analysis, and N2-fixation activity measurements. We show that the microbiomes associated with the phyllosphere of aquatic macrophytes and macroalgal filaments are surprisingly similar, with taxonomic and functional complexity analogous to that of rhizospheric assemblages in terrestrial plants, and have a potential to efficiently recycle nutrients from organic matter. We suggest that especially the fungal associations with these hosts represent an untapped research area of microbial ecology that warrants further attention.
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Data availability
Raw sequences of 16SrDNA and ITS1 amplicons were deposited in the European Nucleotide Archive (ENA) under the study ID PRJEB42360. All other data are available from the authors upon reasonable request.
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Acknowledgements
The study was supported by the Grant Agency of the Czech Republic Project No. P504/17-10493S, and UC Davis Academic Senate grant. We thank the Asociación de Amigos del Lago de Atitlan, CEA–UVG Altiplano, and AMSCLAE for logistical and personnel support. We would also like to thank Martina Čtvrtlíková and Lubomír Adamec for their valuable comments during the manuscript writing period.
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Funding was provided by Grantová Agentura České Republiky (Grant No. P504/17-10493S), UC Davis College of Biological Sciences.
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Figure S1. Guatemala location overview and highlight for Lake Atitlán, Guatemala, CA, with sampling locations (stars) near the San Juan (A), Santiago (B), and San Lucas (C) settlements (modified map from Emery & Brown, 2012).
Supplementary file2 (PDF 392 KB)
Figure S2. Proportion of functional genes involved in organic matter degradation in Hydrilla (Hyd) and Cladophora (Cld) microbiomes. The relative abundances of detected taxa are shown in blue (a). Green plots (b) show the percentage (out of the total number of OTUs) of taxa with confirmed presence of the respective functional gene in the genome.
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Table S1. Operational Taxonomic Unit (OTU) table listing all bacterial and fungal OTUs identified in the study.
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Table S2. List of algal and cyanobacterial species/genera identified in the samples by microscopy, and their presence at the three distinct sampling locations.
Supplementary file5 (XLSX 65 KB)
Table S3. Functional predictions for bacterial taxa (FunGene database output)
Supplementary file6 (XLSX 23 KB)
Table S4. Co-occurrence analysis results listing important network parameters
Supplementary file7 (XLSX 10 KB)
Table S5. Mapping file containing relevant metadata
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de Paula, C.C.P., Bárta, J., Rejmánková, E. et al. The role of macrophyte-associated microbiomes in lacustrine wetlands: an example of the littoral zone of lake Atitlan, Guatemala. Hydrobiologia 851, 1637–1655 (2024). https://doi.org/10.1007/s10750-022-05043-z
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DOI: https://doi.org/10.1007/s10750-022-05043-z