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ITS rDNA polymorphism among species and hybrids of Potamogeton subgenus Coleogeton (Potamogetonaceae) in north-western Europe

By John J. McMullan, Richard J. Gornall and Chris D. Preston


Potamogeton filiformis, P. pectinatus and P. vaginatus are three closely related species that produce sterile\ud hybrids. These hybrids can be extremely difficult to identify, especially if in a vegetative state. To solve this\ud problem, a protocol involving restriction fragment length polymorphism analysis of internal transcribed\ud spacer rDNA is described that allows all three species and their hybrids to be distinguished. Analysis of\ud internal transcribed spacer sequences shows that P. filiformis is closely related to P. vaginatus (differing by\ud only a single substitution), whereas P. pectinatus differs from both by three indels and at least 20\ud substitutions. Infra-specific sequence variation was seen only in P. pectinatus, in which material from arctic\ud Russia differed from that from Scotland, the Nordic region, the Netherlands and Italy by seven mutations

Topics: Botany
Year: 2011
DOI identifier: 10.1179/204234811X13194453002788
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