Shimada H, Sugiura M
Mitsui Plant Biotechnology Research Institute, Tsukuba, Japan.
Nucleic Acids Res. 1991 Mar 11;19(5):983-95. doi: 10.1093/nar/19.5.983.
The entire nucleotide sequences of the rice, tobacco and liverwort chloroplast genomes have been determined. We compared all the chloroplast genes, open reading frames and spacer regions in the plastid genomes of these three species in order to elucidate general structural features of the chloroplast genome. Analyses of homology, GC content and codon usage of the genes enabled us to classify them into two groups: photosynthesis genes and genetic system genes. Based on comparisons of homology, GC content and codon usage, unidentified ORFs can also be assigned to each of these groups such that it is possible to speculate about the functions of products which may be produced by these ORFs. The spacer regions and intron sequences were compared and found to have no obvious homology between rice and liverwort or between tobacco and liverwort.
水稻、烟草和地钱叶绿体基因组的完整核苷酸序列已被测定。我们比较了这三个物种质体基因组中的所有叶绿体基因、开放阅读框和间隔区,以阐明叶绿体基因组的一般结构特征。通过对基因的同源性、GC含量和密码子使用情况的分析,我们能够将它们分为两组:光合作用基因和遗传系统基因。基于同源性、GC含量和密码子使用情况的比较,未鉴定的开放阅读框也可以被归入这两组中的每一组,从而有可能推测这些开放阅读框可能产生的产物的功能。比较了间隔区和内含子序列,发现水稻和地钱之间或烟草和地钱之间没有明显的同源性。