Stein D B, Conant D S, Ahearn M E, Jordan E T, Kirch S A, Hasebe M, Iwatsuki K, Tan M K, Thomson J A
Department of Biological Sciences, Mount Holyoke College, South Hadley, MA 01075.
Proc Natl Acad Sci U S A. 1992 Mar 1;89(5):1856-60. doi: 10.1073/pnas.89.5.1856.
The chloroplast genome of most land plants is highly conserved. In contrast, physical and gene mapping studies have revealed a highly rearranged chloroplast genome in species representing four families of ferns. In all four, there has been a rare duplication of the psbA gene and the order of the psbA, 16S, and 23S rRNA genes has been inverted. Our analysis shows that the described rearrangement results from a minimum of two inversions within the inverted repeat. This chloroplast DNA structure provides unambiguous evidence that phylogenetically links families of ferns once thought to belong to different major evolutionary lineages.
大多数陆地植物的叶绿体基因组高度保守。相比之下，物理图谱和基因图谱研究表明，在代表四个蕨类植物科的物种中，叶绿体基因组发生了高度重排。在所有这四个物种中，都出现了罕见的psbA基因重复，并且psbA、16S和23S rRNA基因的顺序发生了颠倒。我们的分析表明，所描述的重排是由反向重复序列内至少两次倒位导致的。这种叶绿体DNA结构提供了明确的证据，在系统发育上把曾经被认为属于不同主要进化谱系的蕨类植物科联系了起来。
