Upper cortex anatomy corroborates phylogenetic hypothesis in species of Physconia (Ascomycota, Lecanoromycetes)
Upper cortex anatomy corroborates phylogenetic hypothesis in species of Physconia (Ascomycota, Lecanoromycetes)
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DOI：
10.1016/j.mycres.2007.08.009
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发表时间：
2007-11-01
影响因子：
--
通讯作者：
Crespo, Ana
中科院分区：
文献类型：
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作者：
Divakar, Pradeep K.;De Paza, Guillermo Amo;Crespo, Ana
使用 ITS nu-rDNA 作为分子标记，对扭曲旋盘藻形态型复合体进行了系统发育和分类学研究，以重新评估该群体。该分析纳入了欧洲 P. Distorta 以及美洲和欧洲种群的几个样本，最近被命名为 P. americana。系统发育分析表明，扭曲对虾和美洲对虾欧洲种群形成两个单系且部分同域的物种，并且两者都与美洲对虾不同。由于上皮层解剖结构的差异已被用于确定美洲对虾与扭曲对虾的区别，因此对所有这三个类群的上皮层解剖结构进行了重新研究，并揭示了显着的差异。我们的研究证实，扭曲对虾的上皮层是前皮层，菌丝细胞壁厚，管腔狭窄，美洲对虾标本具有典型的半皮层上皮层。两者的皮质解剖结构在纵向和横向截面上看起来基本相同。相反，被称为 P. americana 的欧洲标本与这两者都不同。上皮层的细胞壁相当薄，在横叶切片中，皮层非常类似于半组织。然而，在纵向叶切片中，可以看到这些薄壁细胞是细长的和分枝的，本质上明显是菌丝，并且更好地满足前质细胞的标准。结果证实了旋盘属上皮层解剖结构的进化模式和分类学评估，并揭示了一种常见的未描述物种（P. thorstenii sp. nov.），该物种可以添加到北非和南欧-亚洲地衣植物群中。 (C) 2007 英国真菌学会。由爱思唯尔有限公司出版。保留所有权利。
A phylogenetic and taxonomic study of the Physconia distorta morphotype complex was undertaken using ITS nu-rDNA as a molecular marker to re-evaluate this group. The analysis incorporated several samples of European P. distorta and also of American and European populations, recently named as P. americana. The phylogenetic analysis revealed that P. distorta and the European population of P. americana form two monophyletic and partially sympatric species and that both are distinct from the American species P. americana. Because differences in upper cortex anatomy had been used in establishing P. americana as distinct from P. distorta, the anatomy of the upper cortex was restudied in all three of these taxa, and notable differences were revealed. Our study confirmed that the upper cortex of P. distorta is prosoplectenchymatous with thick hyphal cell walls and narrow lumina, and that American specimens of P. americana have a typical paraplectenchymatous upper cortex. The cortex anatomy of both of these looks essentially the same in both longitudinal and transverse sections. Conversely, the European specimens that have been called P. americana are different from both of these. The cells of the upper cortex are rather thin walled, and in transverse lobe sections the cortex closely resembles a paraplectenchyma. However, in longitudinal lobe sections these thin walled cells can be seen to be elongate and ramified, obviously hyphal in nature, and better meeting the criteria of a prosoplectenchyma. The results confirmed the evolutionary pattern and taxonomic assessment of the anatomy of the upper cortex in the genus Physconia and revealed a common undescribed species (P. thorstenii sp. nov.) that can be added to the North African and Southern Euro-Asiatic lichen flora. (C) 2007 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.