Species diversity and systematics of diatoms based auxospore morphology

基于硅藻的助孢子形态的物种多样性和系统学

• 批准号: 15570087
• 负责人: NAGUMO Tamotsu
• 金额: $ 1.79万
• 依托单位: The Nippon Dental University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15570087/
• 关键词: Diatom; sexual reproduction; auxospore; eproduction; Systematic taxonomy; cryptophyceae; Bacillariophyta; Phycology

Recent studies have led to a rapid increase in knowledge on auxospore formation in diatoms. However, these studies have been limited to centric and raphid pennate diatoms and there is still very little information for the araphid pennate group. We studied the diversity of the auxospore and the initial cell of about 30 taxa in Japanese samples. Genus Lampliscus, Arachnoidiscus, Grammatophora, Ethmia, Gephiria, Eunotia, Achnanthes, Cocconeis, Neidium, Diploneis, Amphora, Entomoneis.These materials were studies using LM and SEM. SEM observation revealed that many transverse perizonial bands, all of which were incomplete rings. There was an irregular longitudinal structure beneath the ventral suture of the transverse perizonium. This structure is presumably equivalent to the longitudinal perizonium in other pennate diatoms. Scales were found both in the inner wall of the perizonium and around the primary perizonial bands in almost species. Presence or absence of scales reflect the phylogenetical trends of diatoms, and when and where exist scales depends on the auxospore structure.

最近的研究导致了对硅藻中孢子发育的认识迅速增加。然而，这些研究仅限于中心和针羽纹硅藻和仍然有很少的信息，araphid羽纹组。我们研究了日本约30个类群的孢子发育和原始细胞的多样性。本文利用光学显微镜和扫描电镜对这些材料进行了研究。扫描电镜下可见许多横带，均为不完整的环状结构。横围带腹缝下方有不规则的纵行结构。这种结构大概相当于其他羽状硅藻的纵向周层。大多数种的围带内壁和围带周围都有鳞片。鳞片的存在与否反映了硅藻的生殖趋势，而鳞片的存在时间和位置取决于孢子发育体的结构。

项目成果

Tamotsu Nagumo: "Taxonomic studies of the subgenus Amphora Cleve of the genus Anphora (Bacillariophyceae) in Japan."Bibliotheca Diatomogica. 49. 1-170 (2003)

Tamotsu Nagumo：“日本 Anphora 属（硅藻纲）的 Amphora Cleve 亚属的分类学研究。”Bibliotheca Diatomogica。

Four cyclotelloid taxa characterized by a ligula-like segment on valvocopula

四个以瓣叶上的舌状片段为特征的小环类群

• 发表时间: 2004
• 期刊: 17th Internat.Diat.Symp.2002
• 作者: Tanaka;H.;T.Nagumo
• 通讯作者: T.Nagumo

Pliocaenicus nipponicus sp. nov., a new freshwater fossil diatom from central Japan,

Pliocaenicus nipponicus sp.

• 发表时间: 2004
• 期刊: Diatom 20
• 作者: Tanaka H.;T.Nagumo
• 通讯作者: T.Nagumo

Morphology and taxonomy of five marine attached diatoms in the genus Grammatophora Ehrenberg (Bacillariophyceae) in Japn,

日本硅藻属（Bacillariophyceae）五种海洋附着硅藻的形态学和分类学，

• 发表时间: 2004
• 期刊: Jpn. J. Phycol. Supple, 52
• 作者: Sato;S.;T.Nagumo;J.Tanaka
• 通讯作者: J.Tanaka

Morphology and taxonomy of five marine attached diatoms in the genus Grammatophora Ehrenberg (Bacillariophyceae) in Japan

日本硅藻属（Bacillariophyceae）五种海洋附着硅藻的形态和分类

• 发表时间: 2004
• 期刊: Jpn.J.Phycol.Supple 52
• 作者: Sato;S.;T.Nagumo;J.Tanaka
• 通讯作者: J.Tanaka