Elucidation of the symbiotic mechanism and its evolutional significance on the red algal symbiont in foraminifer.

有孔虫红藻共生体的共生机制及其进化意义的阐明。

• 批准号: 20570081
• 负责人: YOKOYAMA Akiko
• 金额: $ 3.16万
• 依托单位: University of Tsukuba (2009-2010)Yamagata University (2008)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20570081/
• 关键词: 進化; 共生; 有孔虫; 紅藻; 分子系統; 分類; フィコビリンタンパク質; 系統進化; 分類学; 藻類; 系統

In this study, I focused on a symbiosis between a foraminifers and red algae, and conducted a phylogenetic comparisons among them to clarify the origin and maintenance mechanism of this symbiosis. Formerly, the symbiotic red algae were identified as Porphyridium purpureum. From the results of the molecular phylogenetic analysis, however, all red algal symbionts isolated from the foraminifers were monophyletic and different form typical P. purpureum, which was identical to symbiont. On the other hands, foraminifers having red algal symbionts were also monophyletic. Those results suggested that the single origin of the symbiosis with red algal symbiont in ancient Peneroplidaean foraminifer. However, genetic distances between red algal symbionts collected form different foraminiferan species in the same area were closer than those of the symbionts from same foraminiferan species in the different area. Therefore, the host foraminifers may have extended their distribution ranges and habitats with switching their symbionts in several times.

本研究以有孔虫与红藻的共生为研究对象，对它们的系统发育进行了比较，以阐明这种共生的起源和维持机制。以前，共生红藻被鉴定为紫球藻。从分子系统发育分析的结果来看，从有孔虫中分离到的红藻共生体均为单系，与典型的紫球藻不同，与共生体完全相同。另一方面，含有红藻共生体的有孔虫也是单系。这些结果表明，古前有孔虫与红藻共生的单一来源。然而，同一地区不同有孔虫物种的红藻共生体之间的遗传距离比不同地区同一有孔虫物种的红藻共生体的遗传距离更近。因此，寄主有孔虫可能通过多次切换共生体扩大了分布范围和栖息地。

项目成果

Evolutionaryanalyses of the nuclear-encoded photosynthetic gene psbO from tertiary plastid-containing algae in Dinophyta

甲藻门第三纪质体藻类核编码光合基因 psbO 的进化分析

• DOI: 10.1111/j.1529-8817.2011.00961.x
• 发表时间: 2011
• 期刊: J. Phycol.
• 作者: Yokoyama;A.;Takahashi;F.;Kataoka;H.,Hara;Y. & Nozaki;H.
• 通讯作者: H.

Evolutionary analyses of the nuclear-encoded photosynthetic gene psb0 from tertiary plastid-containing algae in Dinophyta

甲藻门第三纪质体藻类核编码光合基因 psb0 的进化分析

• 发表时间: 2011
• 期刊: Journal of Phycology
• 影响因子: 2.9
• 作者: Akiko Yokoyama;Fumio Takahashi;Hironao Kataoka;Yoshiaki Hara;Hisayoshi Nozaki
• 通讯作者: Hisayoshi Nozaki

単細胞紅藻

单细胞红藻

• 作者: Shahjahan;Md.;他3名;横山亜紀子
• 通讯作者: 横山亜紀子

New unicellular red alga, Bulboplastis apyrenoidosa gen. et sp nov (Rhodellophyceae, Rhodophyta) from the mangroves of Japan: Phylogenetic and ultrastructural observations

• DOI: 10.1111/j.1440-1835.2012.00643.x
• 发表时间: 2012-04-01
• 期刊: PHYCOLOGICAL RESEARCH
• 影响因子: 1.5
• 作者: Kushibiki, Asuka;Yokoyama, Akiko;Hara, Yoshiaki
• 通讯作者: Hara, Yoshiaki

藻類・プロティストの多様な世界

藻类/原生生物的多样化世界

• 发表时间: 2010
• 作者: 原美由紀;松浦匡輔;明賀史純;庄野由里子;永田典子;篠崎一雄;本橋令子;加藤徹;横山亜紀子
• 通讯作者: 横山亜紀子