Molecular Taxonomic Study and Revision of the Three Japanese Species of Asplenium sect. Thamnopteris
Molecular Taxonomic Study and Revision of the Three Japanese Species of Asplenium sect. Thamnopteris
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日本铁角蕨科三种植物的分子分类学研究与修订。
DOI：
10.1007/pl00013856
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发表时间：
1999
影响因子：
2.8
通讯作者：
S. Serizawa
中科院分区：
文献类型：
--
作者：
N. Murakami;Mikio Watanabe;J. Yokoyama;Y. Yatabe;H. Iwasaki;S. Serizawa
铁角蕨组（Asplenium sect.Thamnopteris）或铁角蕨A. [医]巢属复合体是由铁角蕨科特有的联会特征所定义的，即在单层边缘附近有一条分叉的脉。因此，它很容易识别，而且它的单系性也很清楚。尽管作为一个整体，物种的划分是很自然的，但却很混乱。Thamnopteris，A. antiquum Makino，A. australasicum（J.Smith）Hooker和A. [医]巢属在日本已被确认，但每个种的自然性仍然不清楚，因为它们的形态过于简单，无法找到良好的定性分类特征。在目前的工作中，我们研究了种内变化的等位酶和rbcL序列在日本的植物组。Thamnopteris和比较他们与那些从其他古热带地区，以认识自然单位在这样的形态简单的植物。我们在这一部分中发现了大量的遗传变异，推测A. antiquum是一个古老起源的物种，尽管在形态上它与Thamnopteris组的其他物种没有太大区别。它还被发现，所谓的“A。australasicum”的rbcL序列与A. australasicum sensu Holttum，分布于澳大利亚和南太平洋诸岛。根据这些分子数据，我们描述了日本的“A. australasicum”为一新种，刚毛铁角蕨Asplenium setoi N.穆拉克还有塞里兹
Asplenium sect. Thamnopteris or A. nidus L. complex is defined by the synapomorphic character peculiar to Aspleniaceae, an anastomosing vein near the margin of the simple lamina. Thus, it is easily recognizable and its monophyly is quite clear. In spite of its naturalness as the whole group, species delimitation is very confusing. Three species of sect. Thamnopteris, A. antiquum Makino, A. australasicum (J. Smith) Hooker and A. nidus L. have been recognized in Japan, but the naturalness of each species is still not clear because their morphology is too simple to find good qualitative taxonomical characters. In the present work, we examined the intraspecific variation of allozymes and rbcL sequences in the Japanese plants of sect. Thamnopteris and compared them with those from other paleotropical localities in order to recognize natural units in such morphologically simple plants. We found a large amount of genetic variation in this section and inferred that A. antiquum is a species of ancient origin, though morphologically it is not so different from other species of the sect. Thamnopteris. It was also discovered that the so called “A. australasicum” in Japan has a very different rbcL sequence from A. australasicum sensu Holttum, which is distributed in Australia and South Pacific Islands. Based on these molecular data, we described the Japanese “A. australasicum” as a new species, Asplenium setoi N. Murak. et Seriz.