Systematics and evolutionary history of pyrenoid-bearing taxa in brown algae (Phaeophyceae)
Systematics and evolutionary history of pyrenoid-bearing taxa in brown algae (Phaeophyceae)
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褐藻（褐藻纲）中含蛋白核类群的系统学和进化史
DOI：
10.1080/09670262.2011.628698
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发表时间：
2011
影响因子：
2.4
通讯作者：
B. de Reviers
中科院分区：
文献类型：
--
作者：
Thomas Silberfeld;Marie‐Fanny Racault;R. L. Fletcher;A. Couloux;F. Rousseau;B. de Reviers
在褐藻（褐藻纲）中，据报道只有少数类群具有含有类核蛋白的质体，并且该特征通常用于系统描述。 Ectocarpales 的成员在其质体中表现出大的、有柄的和外露的蛋白核，而 Scytothamnales 以及 Asterocladon、Asteronema 和 Bachelotia 属则表现出以星状排列的质体，其中蛋白核嵌入质体基质中。质体特征的进化仍然难以确定，特别是因为褐藻分子系统发育持续缺乏分辨率。在这里，我们为物种丰富的分类群采样生成了一个七位点数据集，以重新评估带有核糖核的褐藻类群的系统发育关系。在 Ectocarpales 中，家庭之间的关系是明确的。微小的脊索动物门 Herponema 属属于不动孢子科 (Acinetosporaceae)。两个神秘属的系统位置被修改：Chordariopsis 被分配到腺囊科，Spongonema 被转移回 Ectocarpacaceae。新目 Asterocladales 是 Ectocarpales 的姊妹目，被认为是容纳 Asterocladon 属的物种。 Scytothamnales 目包括 Bachelotia 属的一个新科 Bachelotiaceae，以及另一个新科 Asteronemataceae，其中包含 Asteronema 属。这些新的分类学见解也揭示了褐藻质体形态和排列的进化。星状质体构型在 Asterocladales 和 Scytothamnales 中独立进化。讨论了 Scytothamnales 和 Asterocladales-Ectocarpales 谱系中恒星结构多样性的进化情景。
In brown algae (Phaeophyceae), only a few taxa are reported to have plastids containing pyrenoids and this character has often been used for systematic delineation. Members of the Ectocarpales display large, stalked and exserted pyrenoids in their plastids, whereas the Scytothamnales, as well as the genera Asterocladon, Asteronema and Bachelotia, exhibit plastids arranged in a stellate configuration with pyrenoids embedded in the plastid stroma. The evolution of plastid characters has remained difficult to establish, especially because of a persistent lack of resolution in brown algal molecular phylogenies. Here, we generated a seven-locus dataset for a species-rich taxon sampling, to reassess phylogenetic relationships of pyrenoid-bearing brown algal taxa. Within the Ectocarpales, the relationships among families are clarified. The minute chordariacean genus Herponema is assigned to the family Acinetosporaceae. The systematic positions of two enigmatic genera are revised: Chordariopsis is assigned to the Adenocystaceae, and Spongonema is transferred back to the Ectocarpaceae. The new order Asterocladales, which is sister to the Ectocarpales, is proposed to accommodate species of the genus Asterocladon. The order Scytothamnales is shown to include the genus Bachelotia in a new family Bachelotiaceae, as well as another new family Asteronemataceae, accommodating the genus Asteronema. These new taxonomic insights also shed light on the evolution of plastid morphology and arrangement in brown algae. Stellate plastid configurations have evolved independently in Asterocladales and Scytothamnales. Evolutionary scenarios underlying the diversity of stellate configurations in the Scytothamnales and the Asterocladales–Ectocarpales lineage are discussed.
影响因子：
2.4
作者：
S. Uwai;Chikako Nagasato;T. Motomura;K. Kogame
通讯作者：
S. Uwai;Chikako Nagasato;T. Motomura;K. Kogame