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Phylogenetic analysis of chromophyte-related colorless flagellates

有色植物相关的无色鞭毛虫的系统发育分析

基本信息

批准号：
08640880
负责人：
INOUYE Isao
金额：
$ 1.47万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The chromophytes or hetrokoint algae is a huge assemblage of autotrophic eukaryotes and as big as the green plants. It comprises various classes of chlorophyll c containing algae such as the Chrysophyceae, Bacillariophyceae, Xanthophyceae, Raphidophyceae and Phaeophyceae. In the lineage of the chromophytes, heterotrophic taxa are also included. These are oomycete fungi (pseudofungi), hyphochytrids, labyrhintulids (net slime molds), which were traditionally classified as fungi, and protozoan flagellates bisocoecids. The taxon including both autotrophic chromophytes and heterotrophic fungi and flagellates is called the stramenopiles, and the chromophytes is believed to have arisen from heterotrophic members through acquisition of the chloroplast by secondary endosymbiosis of red-algae related eukaryote.General ultrastructure and the flagellar apparatus of Cafeteria, a member of the bicosoecids, was examined and compared with chromophyte algae. It was revealed that Cafeteria had homologou … More s flagella/basal bodies and flagellar rootlets. The R3 was especially important, because it was responsible for feeding food particles and food uptake took place in the area between two split bundles of microtubules of the R3 just as in Ochromonas and allied genera (Ochromonadales) in the Chrysophyceae. This result suggested that the phagocytotic ability known in the Chrysophyceae was a symplesiomorphy which appeared in early evolution of the stramenopiles.Developayella sp. nov. (taxon incertae sedis) was also examined. It also had the R3 similar to Cafeteria and food uptake took place at the same portion of the cell, suggesting the R3-mediated feeding is widely distributed in heterotrophic flagellates of the stramenopiles. In Developayella double helix, a structure similar to that of the oomycete fungi, is present. Phylogenetic analysis suggested that Developayella was a close relative of the oomycete fungi. Based on ultrastructural comparison and 18SrDNA analyses, early evolution of the stramenopiles was discussed. Less

色藻或杂色藻类是一个巨大的自养真核生物群落，与绿色植物一样大。它包括各种类型的含有叶绿素c的藻类，如金藻科、硅藻科、黄藻科、雷氏藻科和褐藻科。在色藻的谱系中，还包括异养类群。这些真菌是卵菌类真菌(假真菌)、丝孢子虫、迷路霉菌(传统上被归类为真菌)和原生动物鞭毛虫双子囊虫。包括自养和异养真菌和鞭毛虫的分类群被称为稻草藻，这些色藻被认为是通过与红藻相关的真核生物的次生内共生获得叶绿体而产生的异养成员。据透露，自助餐厅有同源…S的鞭毛/基体和鞭毛细根较多。R3特别重要，因为它负责摄食食物颗粒，食物摄取发生在R3的两束分裂的微管之间的区域，就像金藻中的Ochromonas和相关属(Ochromonadales)一样。这一结果表明，已知的金藻的吞噬能力是一种共形性，在稻草菌的早期进化中就出现了。11月(分类群)也进行了检查。它也有与自助餐厅相似的R3，摄食发生在细胞的同一部分，这表明R3介导的摄食广泛分布在草履虫的异养鞭毛虫中。在发育菌双螺旋中，存在一种与卵菌类真菌相似的结构。系统发育分析表明，发育菌与卵菌属真菌有较近的亲缘关系。在超微结构比较和18SrDNA分析的基础上，讨论了稻纵卷叶蝉的早期演化。较少