Monophyly of Genera and Species of Characeae based on rbcL Sequences, with Special Reference to Australian and European Lychnothamnus barbatus (Characeae: Charophyceae)
Monophyly of Genera and Species of Characeae based on rbcL Sequences, with Special Reference to Australian and European Lychnothamnus barbatus (Characeae: Charophyceae)
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基于rbcL序列的山藻科属和种单系，特别是澳大利亚和欧洲的Lychnothamnus barbatus（山藻科：轮藻纲）
DOI：
10.1071/bt97100
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发表时间：
1999
影响因子：
1.1
通讯作者：
M. Feist
中科院分区：
文献类型：
--
作者：
R. McCourt;K. Karol;M. Casanova;M. Feist
叶绿体编码的Rubisco基因大亚基（rbcL）的序列被用来测试的单系性的多个分离物的物种内，和属内的多个物种，绿色藻类的轮藻纲。简约性和最大似然分析支持属和大多数物种的单系性，除了一个并系组合，包括两个“种”，雌雄异株的轮藻connives Salzm的隔离物。来自A.Br.和雌雄同株C.球孢菌，它们一起构成一个单系群。rbcL的数据支持雌雄同株或雌雄异株的性系统在两个连属-globularis，分支的独立进化。单型Lychnothamnus acidatus（Meyen）Leohn分离株的比较在克罗地亚、德国和澳大利亚的分离株中发现了几乎相同的rbcL序列，尽管所有三个序列都是独特的。这些菌株所表现出的变化是相似的轮藻属和Lamprothamalgae从不同大陆的物种内的菌株之间的变化。有限的变化可能是由于在大陆之间的叶状体或卵孢子的传播;然而，在过去的两个世纪中，已知的欧亚大陆之间的转移的罕见性表明，澳大利亚人口可能不是来自欧洲的外来物种。因此，在澳大利亚和其他地方的Lychnothamnus vanatus种群值得继续保护。
Sequences for the chloroplast-encoded large subunit of the Rubisco gene (rbcL) were used to test the monophyly of multiple isolates within species, and multiple species within genera, of green algae in the Characeae (Class Charophyceae). Parsimony and maximum likelihood analyses supported the monophyly of genera and most species, with the exception of a paraphyletic assemblage comprising isolates of two ‘species’, dioecious Chara connivens Salzm. ex A.Br. and monoecious C. globularis Thuill., which together constitute a monophyletic group. The rbcL data support the independent evolution of either monoecious or dioecious sexual systems in the two connivens-globularis, clades. Comparisons of disjunct isolates of the monotypic Lychnothamnus barbatus (Meyen) Leohn. revealed nearly identical rbcL sequences in isolates from Croatia, Germany and Australia, although all three sequences were unique. The variation exhibited by these isolates was similar to variation between isolates within species of Chara and Lamprothamnium from different continents. The limited variation may be due to dispersal of thalli or oospores between continents; however, the rarity of known intercontinental transfers of Characeae in the last two centuries suggests that the Australian population is probably not an exotic from Europe. Lychnothamnus barbatus populations in Australia and elsewhere thus merit continued protected status.