Reproductive morphology and DNA sequences of the brown alga Platysiphon verticillatus support the new combination Platysiphon glacialis
Platysiphon verticillatus, a brown alga endemic to the Arctic, was described based on vegetative specimens collected at Inglefield Bay, West Greenland. The species is distinctive in having a lanceolate blade‐like thallus terminated by a terete portion, both covered with hair‐like assimilatory filame...
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| Published in: | Journal of phycology Vol. 51; no. 5; pp. 910 - 917 |
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| Main Authors: | , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
Blackwell Publishing Ltd
01-10-2015
Wiley Subscription Services, Inc |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Platysiphon verticillatus, a brown alga endemic to the Arctic, was described based on vegetative specimens collected at Inglefield Bay, West Greenland. The species is distinctive in having a lanceolate blade‐like thallus terminated by a terete portion, both covered with hair‐like assimilatory filaments. Punctaria glacialis was described from Eastern Greenland, and the species differs from other Punctaria species in lacking hairs and plurilocular zoidangia. Unilocular zoidangia were reported, but instead of zoids being released they formed cell walls in situ developing the appearance of plurilocular zoidangia. However, the fate of the zoids, as well as the walled cells was not traced, and the life history of the alga has remained unclear. By comparing DNA sequences (cox1, cox3, and rDNA ITS2) of specimens morphologically referable to Platysiphon verticillatus and Punctaria glacialis collected at Baffin Island, as well as re‐examining morphology and studying crude cultures, we concluded that they are the same taxonomic entity. Furthermore, their cox3 sequence and vegetative morphology agreed with those of the type specimen of Punctaria glacialis. Consequently, we propose Platysiphon glacialis comb. nov. The life cycle could not be completed in culture, but we hypothesize that in situ germination of the unizoids produces reduced gametophytes housed in peripheral tissue of erect sporophytic thalli. |
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| Bibliography: | NERC (Natural Environment Research Council) National Facility for Scientific Diving (NFSD) Genome Canada through the Ontario Genomics Institute ArticleID:JPY12331 TOTAL Foundation Canada Research Chair Program New Brunswick Innovation Foundation ark:/67375/WNG-WRLN5QJG-S JSPS Grants-in-Aid for Scientific Research - No. 22370034; No. 25291087 istex:87866987156CC7D48BFC75A9649B1056DE9CF1DD Canada Foundation for Innovation Ontario Genomics Institute National Science Foundation in the USA - No. DEB-0212138 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0022-3646 1529-8817 |
| DOI: | 10.1111/jpy.12331 |