Why are plastid genomes retained in non-photosynthetic organisms?

被引：157

作者：

Barbrook, AC

Howe, CJ

Purton, S ^{[1
]}

机构：

[1] UCL, Dept Biol, Algal Res Grp, London WC1E 6BT, England

[2] Univ Cambridge, Dept Biochem, Cambridge CB2 1QW, England

来源：

TRENDS IN PLANT SCIENCE | 2006年 / 11卷 / 02期

基金：

英国生物技术与生命科学研究理事会;

关键词：

D O I：

10.1016/j.tplants.2005.12.004

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The evolution of the plastid from a photosynthetic bacterial endosymbiont involved a dramatic reduction in the complexity of the plastid genome, with many genes either discarded or transferred to the nucleus of the eukaryotic host. However, this evolutionary process has not gone to completion and a subset of genes remains in all plastids examined to date. The various hypotheses put forward to explain the retention of the plastid genome have tended to focus on the need for photosynthetic organisms to retain a genetic system in the chloroplast, and they fail to explain why heterotrophic plants and algae, and the apicomplexan parasites all retain a genome in their non-photosynthetic plastids. Here we consider two additional explanations: the 'essential tRNAs' hypothesis and the 'transfer-window' hypothesis.

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页码：101 / 108

页数：8

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