Evolution and origin of the chemical composition of radiolarian test during geologic time scale

地质时间尺度内放射虫测试化学成分的演变和起源

• 批准号: 23540545
• 负责人: TAKAHASHI Osamu
• 金额: $ 3.24万
• 依托单位: Tokyo Gakugei University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540545/
• 关键词: 放散虫; 硫酸ストロンチウム; シリカ; 骨殻; 被殻; 共生藻; 渦鞭毛藻; 国際研究者交流（ノルウェー）; 遊走子; 被殻形成; DNA; SiO2; SrSO4; 進化

Reproductive swarmers of the polycystine radiolarians were examined using light, scanning and transmission electron microscopy. The swarmer cells were about 8um in length with a pear-like shape and a conical end with two flagella. Lipid droplets and characteristically a vacuole-bound SrSO4 crystal were present in the cytoplasm. The morphological features and molecular phylogeny of the reproductive swarmers show evidence of ancestral traits of radiolarians; acantharians and polycystines have a common ancestry. Symbiotic dinoflagellate isolated from polycystine radiolarians was described using both natural and cultured materials. Motile cells were obtained in culture showed unarmored nature and the characteristics suggested it as Gymnodinium. Our results suggest that at least two dinoflagellate symbiont species existed in the radiolarians and they have been possibly reported as "Zooxanthella nutricula" since the 19th century.

利用光学显微镜、扫描电镜和透射电镜对多胱氨酸放射虫的繁殖群进行了观察。游动细胞长约8 μ m，呈梨形，末端圆锥形，有两条鞭毛。脂滴和特征性的液泡结合的硫酸锶晶体存在于细胞质中。生殖群的形态特征和分子系统发育显示了放射虫祖先特征的证据;棘虫和多囊虫有共同的祖先。本文报道了从多胱氨酸放射虫中分离到的共生甲藻。在培养中获得的运动细胞显示出无装甲的性质，其特征表明它是裸裸子藻属。这些结果表明，放射虫中至少存在两种甲藻共生体，它们可能是世纪以来报道的营养虫（Zooxanthella nutricula）。

项目成果

Ultrastructural and molecular characterization of cyanobacterial symbionts in Dictyocoryne profunda (polycystine radiolaria)

• DOI: 10.1007/s13199-012-0174-2
• 发表时间: 2012-05
• 期刊: Symbiosis
• 影响因子: 2.5
• 作者: Tomoko Yuasa;T. Horiguchi;S. Mayama;A. Matsuoka;O. Takahashi

放散虫に共生する藻類の多様性（BBG021-P06）

与放射虫共存的藻类多样性（BBG021-P06）

• 发表时间: 2011
• 作者: Kimura;J. Gill;T. Kunikiyo;I. Osaka;Y. Shimoshioiri;M. Kakasuke;S. Kakubuchi;T. Nagao;K. Furuyama;A. Kamei;H. Kawabata;J. Nakajima;P.E. van Keken;and R.J. Stern;湯浅智子・堀口健雄
• 通讯作者: 湯浅智子・堀口健雄

Ultrastructural and molecular characterization of cyanobacterial endosymbionts in polycystine radiolarians

多胱氨酸放射虫蓝藻内共生体的超微结构和分子特征

• 发表时间: 2012
• 作者: Osamu Takahashi;Tomoko Yuasa;Takeo Horiguchi
• 通讯作者: Takeo Horiguchi

Ultrastructural morphology of the reproductive swarmers of Sphaerozoum punctatum (Huxley) from the East China Sea.

东海点状球藻 (Huxley) 繁殖群体的超微结构形态。

• DOI: 10.1016/j.ejop.2013.12.001
• 发表时间: 2014
• 期刊: European Journal of Protistology
• 影响因子: 2.9
• 作者: Tomoko Yuasa;Osamu Takahashi
• 通讯作者: Osamu Takahashi

Ultrastructure and molecular phylogeny of dinoflagellate symbiont from solitary polycystine radiolarian

孤立性多胱氨酸放射虫甲藻共生体的超微结构和分子系统发育

• 发表时间: 2012
• 作者: Tomoko Yuasa;Takeo Horiguchi;Osamu Takahashi
• 通讯作者: Osamu Takahashi