Studies on systematic relationship of diatoms based on their sexual reproduction in culture.

基于培养中有性繁殖的硅藻系统关系研究。

基本信息

批准号：
03640578
负责人：
HARA Yoshiaki
金额：
$ 1.28万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640578/
关键词：
Diatoms Life cycle Systematic relationship Sexual reproduction Auxospore 珪藻植物類縁黄色植物

项目摘要

Objectives of this research project are the followings; 1)Inducing the gametogenesis of diatoms under laboratory culture conditions, 2)Analysis of the systematic relationship of diatoms based on their structures of auxospore coverings, 3) and based on their life cycle patterns, in particular to their sexual reproduction processes.We could accumulate the significant results of four taxa; Melosila moniliformis var. octagona, Actinocyclus sp., Thalassiosira lacustris and Eunotia tropica, for analizing the systematic and phylogenetic relationship of diatoms. These are briefly reported, focusing on their sexual reproduction processes.M. moniliformis var. octagona: monoecious, four sperms hologeneusly born from the mother cell(new finding), auxospore formed by a sperm with a flagellum penetrating into an oogonium, scally perizonia covering with the auxospore in which a large initial vegetative cell is produced.Actinocyclus sp.: monoecious, four sperms merogenously formed from the mother cell(30-50um), auxospore formed by the same manner as M. moniliformis var. octagona, and covered with scally perizonia(new finding), bearing an initial of the vegetative cell(90-130um).Thalassiosira lacustris: monoecious, eight sperms merogenously formed from the mother cell, auxospore(ca.30um) formed by the same manner as M. moniliformis var. octagona, and covered with scally perizonia(new finding), bearing an initial vegetative cell(ca.80um).Eunotia tropica: dioecious(first case in the Protoraphidioideae), pairing cells producing a gamete in each, gametes fusing and becoming a auxospore covered with band-shaped perizonia which possess similar pattern of notches to those of scally ones in a part.

该研究项目的目标是以下内容； 1）在实验室培养条件下诱导硅藻的配子发生，2）基于硅藻的结构，分析硅藻的系统关系，3）和基于它们的生命周期模式，尤其是根据其性生殖过程。我们可以积累四个分类的重要结果； Melosila moniliformis var。八角形，静脉细胞囊泡，thalassiosira lacustris和Tropica Eunotia，用于分析硅藻的系统和系统发育关系。这些简短报道了这些，重点是他们的有性繁殖过程。 Moniliformis var。八角形：单宗教，四个精子从母细胞（新发现）出生，由一个精子形成，由一个精子形成，鞭毛渗透到一个卵子中，scally perizonia覆盖着脑孢子，上面覆盖了辅助孢子，其中大量的初始营养细胞是生产的。与M. Moniliformis var相同的方式。八角形，并覆盖有scally perizonia（新发现），并带有植物细胞（90-130um）的初始化。thalassiosira lacustris：单张鸡，八个精子，由母细胞，Auxospoper（Ca.30UM）形成，以与Moniilliformiss M. Moniliformis var相同的方式形成。 octagona, and covered with scally perizonia(new finding), bearing an initial vegetative cell(ca.80um).Eunotia tropica: dioecious(first case in the Protoraphidioideae), pairing cells producing a gamete in each, gametes fusing and becoming a auxospore covered with band-shaped perizonia which possess similar pattern of notches to those of scally ones in a part.