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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| Format: | Journal Article |
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| Abstract | 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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| AbstractList | 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. 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 ( cox 1, cox 3, and rDNA ITS 2) 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 cox 3 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. 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. |
| Author | Kawai, Hiroshi Yamagishi, Takahiro Saunders, Gary W. Kai, Atsushi Lane, Chris E. Küpper, Frithjof C. Hanyuda, Takeaki McDevit, Dan |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/26986887$$D View this record in MEDLINE/PubMed |
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| Cites_doi | 10.1111/j.1440-1835.2009.00530.x 10.1111/j.1469-8137.1978.tb02281.x 10.1016/S0022-5320(69)90033-1 10.1111/j.1529-8817.2004.03153.x 10.1111/j.1440-1835.2008.00510.x 10.1016/j.ympev.2010.04.020 10.1111/jpy.12332 10.1126/science.1139426 10.1139/b11-079 10.1515/bot.2011.017 10.1007/BF02488643 10.2216/i0031-8884-6-1-62.1 10.1016/j.ympev.2007.03.016 10.1111/j.1529-8817.2006.00204.x 10.1038/nature10581 10.3119/09-12.1 10.1016/S0076-6879(80)65044-7 10.1111/j.1529-8817.2010.00818.x 10.1111/j.1529-8817.2011.01054.x 10.2216/i0031-8884-22-4-387.1 10.1016/S0764-4469(01)01306-3 10.1080/09670260903383271 10.1111/j.1440-1835.2012.00651.x |
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| Copyright | 2015 Phycological Society of America 2015 Phycological Society of America. |
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| Keywords | Arctic Ocean Platysiphon glacialis comb. nov life history molecular phylogeny Phaeophyceae |
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| Snippet | Platysiphon verticillatus, a brown alga endemic to the Arctic, was described based on vegetative specimens collected at Inglefield Bay, West Greenland. The... Platysiphon verticillatus , a brown alga endemic to the Arctic, was described based on vegetative specimens collected at Inglefield Bay, West Greenland. The... |
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| SubjectTerms | Arctic Ocean life history molecular phylogeny Phaeophyceae Platysiphon glacialis comb. nov |
| Title | Reproductive morphology and DNA sequences of the brown alga Platysiphon verticillatus support the new combination Platysiphon glacialis |
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