Potamogeton×exilis (P. alpinus×P. natans), a new hybrid pondweed from Finland

Kaplan, Zdeněk; Uotila, Pertti

doi:10.1111/j.1756-1051.2011.01240.x

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…(1) Relict from a past occurrence of the parental species in Western Australia: Previous studies conducted in Europe showed that sterile Potamogeton hybrids can persist vegetatively in the absence of the parental species for very long periods, up to centuries or even millennia, presumably as remnants after one or both parents disappeared (e.g. Preston et al 1998;Kaplan and Fehrer 2004Kaplan and Uotila 2011). Recently, Kaplan et al (2018) identified a sterile clone of P. pulcher Tuck.…”

Section: Discussionmentioning

confidence: 99%

Discovery of the Northern Hemisphere hybrid Potamogeton ×salicifolius in the Pilbara region of Western Australia

Kaplan

Fehrer²,

Jobson³

2019

Telopea

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e interspeci c hybrid Potamogeton ×salicifolius (= P. lucens × P. perfoliatus), so far known only from several countries of Europe and a few countries of Asia, was discovered in Western Australia. Morphology of the Australian specimens ts the range of variation observed in Eurasian specimens. DNA sequencing con rmed the morphological identi cation as a hybrid P. lucens × P. perfoliatus, and identi ed P. lucens as the maternal parent. is identity is surprising because neither of the parental species are known to occur in Western Australia and P. lucens currently does not even occur in the continent. ree possible explanations for the occurrence of P. ×salicifolius in Western Australia are discussed: its relictual occurrence from a time when both the parental species occurred there, long-distance dispersal of a hybrid seed from Eurasia and the remnant of local cultivation or intentional planting.

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Section: Discussionmentioning

confidence: 99%

Discovery of the Northern Hemisphere hybrid Potamogeton ×salicifolius in the Pilbara region of Western Australia

Kaplan

Fehrer²,

Jobson³

2019

Telopea

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“…A similar case is known from Scandinavia [34] where Callitriche × vigens is frequent in southernmost Sweden, although one of the parental species ( C. cophocarpa ) is fairly rare there. Occurrence of hybrids in different areas very long after the disappearances of their parents is well documented in Potamogeton and Stuckenia [16], [35], [37], [127]–[129], and it is probable in Ranunculus subsp. Batrachium [17], [33].…”

Section: Discussionmentioning

confidence: 99%

Genome Size as a Key to Evolutionary Complex Aquatic Plants: Polyploidy and Hybridization in Callitriche (Plantaginaceae)

et al. 2014

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Despite their complex evolutionary histories, aquatic plants are highly underrepresented in contemporary biosystematic studies. Of them, the genus Callitriche is particularly interesting because of such evolutionary features as wide variation in chromosome numbers and pollination systems. However, taxonomic difficulties have prevented broader investigation of this genus. In this study we applied flow cytometry to Callitriche for the first time in order to gain an insight into evolutionary processes and genome size differentiation in the genus. Flow cytometry complemented by confirmation of chromosome counts was applied to an extensive dataset of 1077 Callitriche individuals from 495 localities in 11 European countries and the USA. Genome size was determined for 12 taxa. The results suggest that many important processes have interacted in the evolution of the genus, including polyploidization and hybridization. Incongruence between genome size and ploidy level, intraspecific variation in genome size, formation of autotriploid and hybridization between species with different pollination systems were also detected. Hybridization takes place particularly in the diploid – tetraploid complex C. cophocarpa – C. platycarpa, for which the triploid hybrids were frequently recorded in the area of co-occurrence of its parents. A hitherto unknown hybrid (probably C. hamulata × C. cophocarpa) with a unique chromosome number was discovered in the Czech Republic. However, hybridization occurs very rarely among most of the studied species. The main ecological preferences were also compared among the taxa collected. Although Callitriche taxa often grow in mixed populations, the ecological preferences of individual species are distinctly different in some cases. Anyway, flow cytometry is a very efficient method for taxonomic delimitation, determination and investigation of Callitriche species, and is even able to distinguish homoploid taxa and identify introduced species.

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“…However, in contrast to many plant genera whose hybrids are sterile, short-lived F1 plants, a sterile hybrid in Stuckenia can persist vegetatively for a long time and even spread as stem fragments. Previous studies have demonstrated that hybrid pondweeds can persist in a locality for a considerable period, even hundreds or thousands of years, and sometimes even after one or both parents have disappeared (e.g., Kaplan and Wolff, 2004;Zalewska-Gałosz, 2010;Kaplan and Uotila, 2011;Zalewska-Gałosz et al, 2018;Kaplan et al, 2018), provided that the ecological conditions remain suitable. For example, the distribution of S. ×suecica in England, south of the present limit of distribution of S. filiformis, suggests that these clones are relicts from glacial periods (Hollingsworth et al, 1996).…”

Section: Interspecific Hybridizationmentioning

confidence: 99%

Evolutionary history and patterns of geographical variation, fertility, and hybridization in Stuckenia (Potamogetonaceae)

et al. 2022

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Aquatic plant species are often widespread, even across continents. They pose a challenge to species delimitation and taxonomy due to their reduced morphology and high phenotypic plasticity. These difficulties are even more pronounced in the case of interspecific hybridization. We investigate the aquatic plant genus Stuckenia for the first time on a worldwide scale. Expert species determination is aided by sequencing of nuclear ribosomal ITS and 5S-NTS regions and the plastid intergenic spacers rpl20-5’rps12 and trnT–trnL. Nuclear markers are used to infer hybridization, and the maternal origin of hybrids is addressed with plastid markers. Pure species are subjected to phylogenetic analyses. Two main Stuckenia lineages are found: one consists of S. amblyphylla, S. filiformis, S. pamirica, and S. vaginata, the other includes S. pectinata and S. striata. The widespread species S. pectinata, S. filiformis, and S. vaginata show intraspecific genetic variation, which is structured geographically. Many intraspecific hybrids, which are usually fertile, occur between those genotypes. Interspecific hybrids, which are consistently sterile, are detected among all widespread species; some are reported for the first time in several countries and regions. They originated multiple times from reciprocal crosses and reflect the geographical origins of parental genotypes. Intraspecific genetic variation can be higher than interspecific differences between closely related species. Comparison of phenotypic variation in the field and in cultivation with genotypic variation shows that numerous conspicuous forms have been overestimated taxonomically. These are resolved as phenotypes responding to unusual environments, have recurrently evolved adaptations, or represent extreme forms of continuous variation of the recognized species. However, some specific regional lineages, which have evolved from variable species, may be interpreted as early steps of the speciation process. Hybridization has been underestimated in some regions as a source of Stuckenia diversity, and the respective hybrid plants have been misidentified as intraspecific taxa or even as separate species. Many erroneous entries in sequence databases are detected and summarized. This work provides a sound basis for species delimitation and hybrid recognition in this difficult genus.

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Potamogeton×exilis (P. alpinus×P. natans), a new hybrid pondweed from Finland

Cited by 11 publications

References 33 publications

Discovery of the Northern Hemisphere hybrid Potamogeton ×salicifolius in the Pilbara region of Western Australia

Discovery of the Northern Hemisphere hybrid Potamogeton ×salicifolius in the Pilbara region of Western Australia

Genome Size as a Key to Evolutionary Complex Aquatic Plants: Polyploidy and Hybridization in Callitriche (Plantaginaceae)

Evolutionary history and patterns of geographical variation, fertility, and hybridization in Stuckenia (Potamogetonaceae)

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