Phylogenetic relationships within the Fucales (Phaeophyceae) assessed by the photosystem I coding psaA sequences
Phylogenetic relationships within the Fucales (Phaeophyceae) assessed by the photosystem I coding psaA sequences
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DOI：
10.2216/05-48.1
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发表时间：
2006-09-01
期刊：
影响因子：
1.6
通讯作者：
Boo, Sung Min
中科院分区：
文献类型：
--
作者：
Cho, Ga Youn;Rousseau, Florence;Boo, Sung Min
墨角藻褐藻在维持潮间带至潮下带生态系统方面具有重要的生态学意义，目前是DNA测序的对象。我们分析了光系统1编码psaA基因（1488个碱基对），从26个分类群在所有家庭的墨角藻，包括Nemoderma tingitanum和Microzonia velutina作为外群物种。共41个分类群，包括发表的序列从三个岩藻和13褐藻，用于系统发育分析。psaA基因组证实了以前的想法，根据以前的研究，使用形态和核核糖体基因，表明岩藻是单系的，包括Durvillaeaceae和Notheiaceae。然而，在所有的分析的psaA数据，Notheiaceae，特有的澳大拉西亚，占据了基础的位置内的顺序。除胞壁菌科外，所有科都是单系的。psaA数据与先前的核核糖体DNA数据和自形形态特征一起强烈支持Bifurcariopsis和Xiphophora属应分别从Cystoseiraceae和Fucaceae中分离出来。两个新的家庭，Bifurcarioptophiaceae和剑，建议容纳每个属。的psaA数据同意的形态学和地理学的假设，岩藻可能起源于澳大利亚的沃茨，并已成为建立在北方。目前的研究结果表明，psaA区域是一个新的工具，更好地了解岩藻内的系统发育关系。
hFucalean brown algae are ecologically important for maintaining intertidal to subtidal ecosystems and are currently a subject for DNA phylogenies. We analyzed the photosystem 1 coding psaA gene (1488 base pairs) from 26 taxa in all families of the Fucales including Nemoderma tingitanum and Microzonia velutina as outgroup species. A total of 41 taxa, including published sequences from three fucalean and 13 brown algae, were used for phylogenetic analyses. The psaA phylogenies confirmed previous ideas, based on previous studies using morphology and nuclear ribosomal genes, suggesting that the fucalean algae are monophyletic, including the Durvillaeaceae and Notheiaceae. However, in all analyses of the psaA data, the Notheiaceae, endemic to Australasia, occupied a basal position within the order. All families except the Cystoseiraceae are monophyletic. The psaA data together with previous nuclear ribosomal DNA data and autapomorphic morphological characters strongly support that the genera Bifurcariopsis and Xiphophora should be separated from the Cystoseiraceae and the Fucaceae, respectively. Two new families, Bifurcariopsidaceae and Xiphophoraceae, are proposed to accommodate each of the genera. The psaA data concur with the morphological and biogeographical hypotheses that fucalean algae might have originated from Australasian waters and have become established in the northern hemisphere. The present results indicate that the psaA region is a new tool for better understanding phylogenetic relationships within fucalean algae.