Abstract
The aquatic fern Salvinia molesta D.S. Mitch. is an invasive species that can have devastating effects on the freshwater habitats it colonizes. Currently, a lack of clarity surrounding the genomic composition and genetic diversity of S. molesta impedes eradication efforts. Salvinia molesta is a polyploid hybrid with unknown and controversial parentage, first noted in Africa but morphologically similar to South American species. Giant salvinia is also thought to reproduce primarily, perhaps exclusively, through vegetative reproduction, raising the possibility that the global invasion comprises one or a few clonal genotypes. This research focuses on identifying the maternal genome donor of S. molesta, determining if this species consists of a single or multiple independently derived lineages, and evaluating invasive-range genotypic diversity. Whole chloroplast genome (plastome) sequencing from field-collected and herbarium specimens was used to quantify genetic diversity in S. molesta and the phylogenetic relationships among Salvinia species. Phylogenetic analysis revealed that S. molesta and S. herzogii share the same plastome, although S. herzogii is unlikely to be S. molesta’s maternal progenitor due to its own hybrid status and odd ploidy. Rather, we conclude that S. molesta’s maternal progenitor is either an undescribed or extinct species. The observed plastome diversity within S. molesta indicates the presence of multiple divergent genotypes which strongly suggest multiple origins of this hybrid. Additionally, this diversity clearly indicates that a single clone does not dominate the invasive range. This genomic diversity could have direct implications for the successful management of this invasive species, particularly for biological control.
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Data availability
All sequencing reads generated during this project are available on the NCBI Sequencing Read Archive (SRA) (BioProject ID #PRJNA925219).
References
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Acknowledgements
The authors would like to thank Garrie Landry for help with fieldwork, and the curators of ARIZ, BRIT, F, FLAS, FLOR, FUEL, FURB, MBM, MBML, MO, NY, US and VIC for permission to sample from herbarium specimens.
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This work was supported by National Science Foundation award OIA 1920858 to EMS and JBB, by the Wichita State University Department of Biological Sciences and by the University of Louisiana at Lafayette Department of Biology.
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SH, JB and ES contributed to study conception and design. Fieldwork was conducted by SH, JB, ES, Brittany Sutherland, and Pedro Bond Schwartsburd. Data collection and analysis was conducted by SH and JB. The first draft of the manuscript was written by Stacy Holt and James Beck and all authors commented on previous versions of the manuscript. All authors read and approved of the final manuscript.
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Holt, S.D., Sigel, E.M., Sutherland, B.L. et al. What is Salvinia molesta (Salviniaceae)? Determining the maternal progenitor and genetic diversity of the clonal invasive fern giant salvinia. Biol Invasions 25, 2131–2141 (2023). https://doi.org/10.1007/s10530-023-03028-0
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DOI: https://doi.org/10.1007/s10530-023-03028-0