Molecular phylogenetics of an aquatic plant lineage, Potamogetonaceae

@article{Lindqvist2006MolecularPO,
  title={Molecular phylogenetics of an aquatic plant lineage, Potamogetonaceae},
  author={Charlotte Lindqvist and Jan De Laet and Robert R. Haynes and Lone Aagesen and Brian R. Keener and Victor A. Albert},
  journal={Cladistics},
  year={2006},
  volume={22}
}
Like most aquatic plants, the pondweeds (Potamogetonaceae) are among the most phenotypically reduced and plastic of all angiosperms. As such, hypotheses of structural homology present difficulties for morphological phylogenetic reconstruction. We used non‐coding nuclear and plastid DNA data to address Potamogetonaceae relationships and accompanying issues in character evolution and biogeography. Genera currently assigned to Potamogetonaceae, plus Zannichellia, formed a strongly supported… 
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The authors' observations may suggest the presence of some genetic mechanisms that promote a higher impact of the maternal lineage on the expression and evolution of the hybrid variability both at the molecular (direction of concerted evolution in hybrids) and the morphological level.
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TLDR
The results from ITS sequence divergence corroborate the separation of the two families noted by some authors, and are in accordance with the substantial morphological differences between them.
IDENTIFICATION OF PUTATIVE HYBRIDS AND NATURAL LINEAGES IN GENUS POTAMOGETON REVEALED BY CHLOROPLAST AND NUCLEAR DNA MARKERS
TLDR
Comparing the phylogenetic relationships of subgenus Potamogeton with floral size, it is proposed that the split in the two main lineages reflects an early differentiation of flower size, perhaps due to the shift from out- to in-breeding.
Identification of Hybrids in Potamogeton: Incongruence between Plastid and ITS Regions Solved by a Novel Barcoding Marker PHYB
TLDR
It is recommended that a three-locus combination of chloroplast DNA gene, ITS and PHYB is potential to effectively reveal more robust phylogenetic relationships and species identification in Potamogeton.
Systematics of Two Imperiled Pondweeds (Potamogeton vaseyi, P. gemmiparus) and Taxonomic Ramifications for Subsection Pusilli (Potamogetonaceae)
TLDR
Phylogenetic analyses of nrITS and trnK 5′ intron sequence data clearly endorse the recognition of P. gemmiparus and P. vaseyi as distinct species but call into question the subspecific circumscription ofP.
Revision of chromosome numbers of Potamogetonaceae: a new basis for taxonomic and evolutionary implications
TLDR
The chromosome numbers of 181 samples of 47 species and 32 hybrids of Potamogetonaceae from 27 countries and areas are determined and reevaluated, giving an example of how the careful re-examination of chromosome numbers can substantially ameliorate interpretations of systematic and phylogenetic patterns.
Are linear-leaved Potamogeton hybrids really so rare? Molecular evidence for multiple hybridizations between P. acutifolius and P. compressus in central Europe
TLDR
It is suggested that hybrids of linear-leaved Potamogeton species are more common than usually believed, but have been difficult to identify without molecular tools.
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