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Establishment of a Clonal Culture of Unicellular Conjugating Algae
Published on: July 14, 2018
在蓝藻细菌辐射中,有多种进化起源的前类植物
E Urbach1, D L Robertson, S W Chisholm
1Ralph M. Parsons Laboratory, Massachusetts Institute of Technology, Cambridge 02139.
Nature
|January 16, 1992
概括
含有叶绿素b的叶绿素植物不是一个单一的进化群. 这些有氧光生物将这种特征融合进化,与绿色叶绿体的祖先分开.
科学领域:
- 微生物学 微生物学
- 进化生物学 进化生物学
- 物理学的生理学
背景情况:
- 类别分类群Prochlorales是由含有叶绿素b的原生物氧性光合作用生物组成的,类似于植物和藻类的叶绿体.
- 据假设,甲类植物是一个单类群体,与"绿色"质体有着共同的祖先.
- 之前的分子系谱对Prochlorothrix hollandica与塑类动物的直接血统产生了怀疑.
研究的目的:
- 用16S核糖体RNA (rRNA) 基因序列比较来研究前类植物的进化关系.
- 为了确定是否与"绿色"叶绿体共享共同的祖先.
- 为了澄清Prochlorococcus marinus和Prochloron sp.的遗传位置. 在蓝菌辐射中.
主要方法:
- 16S核糖体RNA (rRNA) 基因序列的比较.
- 分子序列的遗传学分析.
- 包括来自Prochlorococcus marinus和Prochloron sp.的新序列
主要成果:
- 发现,在蓝藻细菌辐射中,甲植物是多种类的,而不是单种类的群体.
- 已知没有任何一种前植物物种与叶绿体有特定的相关性,这表明它们具有不同的进化起源.
- 菌的16S rRNA基因序列与开放海洋的菌菌株 (海洋群A) 非常相似.
结论:
- 叶绿素b和相关蛋白质在叶绿素和绿色叶绿体祖先中的获取是通过融合进化的过程发生的.
- 叶绿藻不是一个统一的进化血统,导致叶绿细胞.
- 普罗克洛科克与海洋赛内科科克菌株有着密切的进化关系.
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