REPRODUCTIVE MORPHOLOGY AND DNA SEQUENCES OF THE BROWN ALGA PLATYSIPHON VERTICILLATUS SUPPORT THE NEW COMBINATION PLATYSIPHON GLACIALIS
REPRODUCTIVE MORPHOLOGY AND DNA SEQUENCES OF THE BROWN ALGA PLATYSIPHON VERTICILLATUS SUPPORT THE NEW COMBINATION PLATYSIPHON GLACIALIS
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DOI：
10.1111/jpy.12331
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发表时间：
2015-10-01
影响因子：
2.9
通讯作者：
Saunders, Gary W.
中科院分区：
文献类型：
--
作者：
Kawai, Hiroshi;Hanyuda, Takeaki;Saunders, Gary W.
根据在西格陵兰岛英格尔菲尔德湾采集的营养标本，描述了北极特有的褐藻--轮状扁虹吸藻。该种的独特之处在于具有披针形叶片状的叶状体，末端为圆柱状部分，两者都被毛状的同化花丝覆盖。冰盖Punctaria glcialis产于格陵兰岛东部，与其他Punctaria物种不同的是，该种缺乏毛发和多眼的带状突起。报道了单眼的带状幼虫，但它们不是被释放，而是在原位形成细胞壁，形成多眼的带状带状幼虫。然而，这些动物以及有壁细胞的命运并没有被追踪，这种藻类的生活史也仍然不清楚。通过对采自巴芬岛的扁虹吸虫和冰盖藻属标本的DNA序列(cox1、cox3和rDNA ITS2)的比较，以及对形态的重新观察和对原始培养物的研究，我们认为它们是同一个分类实体。此外，它们的cox3序列和营养形态与冰盖Punctaria glcialis模式标本一致。因此，我们提出了冰盖扁虹吸虫。11月生活史不能在培养中完成，但我们假设，在直立的孢子体的周围组织中，UNIZIZIZE的原位萌发产生了减少的配子体。
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.