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A New Record of Potamogeton xangustifolius J. Presl (Potamogetonaceae) in Japan

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Title: A New Record of Potamogeton xangustifolius J. Presl (Potamogetonaceae) in Japan
Authors: Shutoh, Kohtaroh Browse this author
Usuba, Mitsuru Browse this author
Yamagishi, Hiroki Browse this author
Fujita, Yushi Browse this author
Shiga, Takashi Browse this author
Keywords: Aomori Prefecture
Aquatic plants
Japanese flora
Molecular identification
Tohoku District
Issue Date: 20-Aug-2020
Publisher: Japanese Society for Plant Systematics
Journal Title: Acta Phytotaxonomica et Geobotanica
Volume: 71
Issue: 1
Start Page: 33
End Page: 44
Publisher DOI: 10.18942/apg.201914
Abstract: Potamogeton xangustifolius (P. gramineus x P. lucens) was newly recorded in Japan from a pond in Tsugaru-shi, Aomori Prefecture. The hybrid nothospecies was identified based on morphological observations and measurements, molecular analyses using cloned nuclear adhA gene and chloroplast rpl20rps12 intergenic spacer, and pollen viability. The putative hybrid had morphological traits intermediate between P. gramineus and P. lucens, nuclear haplotypes matching those of the two parental lineages, and lower pollen viability than P. lucens (not compared with P. gramineus). The maternal lineage of the hybrid was presumed to be P. gramineus, based on chloroplast sequences. The hybrid characteristically shows well-branched stems in the upper part of shoots, as in P. gramineus, and both clearly petiolate and sessile submerged leaves with distinctive netted venation. Similar plants were collected in the 1980s from a ditch near the pond, suggesting that the hybrid may have been present for more than 30 years in this area.
Type: article
Appears in Collections:総合博物館 (The Hokkaido University Museum) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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