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Tiny Plants with Enormous Potential: Phylogeny and Evolution of Duckweeds

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Part of the book series: Compendium of Plant Genomes ((CPG))

Abstract

Duckweeds (family Lemnaceae) comprise 37 angiosperm species, which are distributed among five genera. Although these tiny specimens represent the smallest flowering plants on earth, the group is practically ubiquitous in water bodies worldwide. The paucity of morphological features in duckweeds has made it difficult to elucidate their evolutionary history, or to present a compelling classification of the group, but more recent molecular evidence has facilitated an improved systematic evaluation of these unique plants. The duckweeds are closely related to aroids (family Araceae), with which they share several morphological features. Within Lemnaceae, the two species of Spirodela and the monotypic genus Landoltia are more distantly related to other duckweeds than are the larger genera Lemna, Wolffia, and Wolffiella to one another. A substantial amount of plastid DNA sequence data has upheld a phylogeny for the family that is mostly consistent, and many of those relationships have been corroborated by the recent addition of nuclear DNA data. Morphologically, the genera lacking roots (Wolffia and Wolffiella) comprise a single lineage, as do the three largest genera (Lemna, Wolffia, and Wolffiella) that are more reduced in comparison with Landoltia and Spirodela. The biogeography of Lemnaceae indicates that numerous dispersal events have occurred in relatively recent evolutionary time, and that several species essentially are cosmopolitan. Although not particularly speciose, duckweeds comprise a surprisingly diverse group with much potential for exploring various genetic, biochemical, and metabolic phenomena.

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Acknowledgements

We are grateful to Daniel J. Crawford for reviewing the novel biogeographical research presented here and to Paul Fourounjian, Wenqin Wang, and Hieu Cao for editorial assistance.

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Correspondence to Donald H. Les .

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Tippery, N.P., Les, D.H. (2020). Tiny Plants with Enormous Potential: Phylogeny and Evolution of Duckweeds. In: Cao, X., Fourounjian, P., Wang, W. (eds) The Duckweed Genomes. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-030-11045-1_2

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