The complete chloroplast and mitochondrial genome sequences of Boea hygrometrica: insights into the evolution of plant organellar genomes.
The complete chloroplast and mitochondrial genome sequences of Boea hygrometrica: insights into the evolution of plant organellar genomes.
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DOI：
10.1371/journal.pone.0030531
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Yu J
中科院分区：
文献类型：
--
作者：
Zhang T;Fang Y;Wang X;Deng X;Zhang X;Hu S;Yu J
测定了苦苣苔科（Gesneriaceae）复活植物Boeahyrometrica的叶绿体（CP）和线粒体（MT）基因组的全序列，其长度分别为153，493 bp和510，519 bp。叶绿体基因组较小，编码基因较多（147个），占72%;线粒体基因组较大，编码基因较少（65个），占12%。与其他种子植物类似，Bh cp基因组具有典型的四方组织，每个区域都有一个保守基因。Bh mt基因组具有三个长度为222 bp、843 bp和1474 bp的重组序列重复，其将基因组分成单个主环（MC）和四个异构分子。与其他被子植物相比，Bh mt基因组的一个显著特征是在最近的Bh进化过程中，cp基因组的遗传物质频繁转移。我们还分析了细胞器基因组进化一般关于基因组特征以及序列和基因结构/组织的组成动态，为理解植物细胞器基因组的进化提供线索。在被子植物线粒体基因组中发现的包括tRNA在内的CP衍生序列支持这样的结论，即频繁的基因转移事件可能在陆地植物谱系的早期就开始了。
The complete nucleotide sequences of the chloroplast (cp) and mitochondrial (mt) genomes of resurrection plant Boea hygrometrica (Bh, Gesneriaceae) have been determined with the lengths of 153,493 bp and 510,519 bp, respectively. The smaller chloroplast genome contains more genes (147) with a 72% coding sequence, and the larger mitochondrial genome have less genes (65) with a coding faction of 12%. Similar to other seed plants, the Bh cp genome has a typical quadripartite organization with a conserved gene in each region. The Bh mt genome has three recombinant sequence repeats of 222 bp, 843 bp, and 1474 bp in length, which divide the genome into a single master circle (MC) and four isomeric molecules. Compared to other angiosperms, one remarkable feature of the Bh mt genome is the frequent transfer of genetic material from the cp genome during recent Bh evolution. We also analyzed organellar genome evolution in general regarding genome features as well as compositional dynamics of sequence and gene structure/organization, providing clues for the understanding of the evolution of organellar genomes in plants. The cp-derived sequences including tRNAs found in angiosperm mt genomes support the conclusion that frequent gene transfer events may have begun early in the land plant lineage.
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