Comparative Bioinformatics Analysis of the Chloroplast Genomes of a Wild Diploid Gossypium and Two Cultivated Allotetraploid Species

文献类型： 外文期刊

第一作者： Farshid Talat

作者： Farshid Talat ;Kunbo Wang

作者机构：

关键词： Chloroplast genome;Complete sequence;Gossypium thurberi

期刊名称：IRANIAN JOURNAL OF BIOTECHNOLOGY （ 影响因子：1.671； 五年影响因子：2.058 ）

ISSN： 1728-3043

年卷期： 2015 年 13 卷 3 期

页码：

收录情况： SCI

摘要： Background: Gossypium thurberi is a wild diploid species that has been used to improve cultivated allotetraploid cotton. G. thurberi belongs to D genome, which is an important wild bio-source for the cotton breeding and genetic research. To a certain degree, chloroplast DNA sequence information are a versatile tool for species identification and phylogenetic implications in plants. Different chloroplast loci have been utilized for evaluating phylogenetic relationships at each classification level among plant species, including at the interspecies and intraspecies levels. Present study was conducted in order to analyse the sequence of its chloroplast. Objectives: Present study was conducted to study and compare the complete chloroplast sequence of G. thurberi, analyses of its genome structure, gene content and organization, repeat sequence and codon usage and comparison with two cultivated allotetraploid sequenced cotton species. Materials and Methods: The available sequence was assembled by DNAman (Version 8.1.2.378). Gene annotation was mainly performed by DOGMA. The map of genome structure and gene distribution were carried out using OGDRAW V1.1. Relative synonymous codon usage (RSCU) of different codons in each gene sample was calculated by codonW in Mobyle. To determine the repeat sequence and location, an online version of REPuter was used. Results: The G. thurberi chloroplast (cp) genome is 160264 bp in length with conserved quadripartite structure. Single copy region of cp genome is separated by the two inverted regions. The large single copy region is 88,737 bp, and the small single copy region is 20,271 bp whereas the inverted repeat is 25,628 bp each. The plastidic genome has 113 single genes and 20 duplicated genes. The singletones encode 79 proteins, 4 ribosomal RNA genes and 30 transfer RNA genes. Conclusions: Amongst all plastidic genes only 18 genes appeared to have 1-2 introns and when compared with cpDNA of two cultivated allotetraploid, rps18 was the only duplicated gene in G. thurberi. Despite the high level of conservation in cp genome SSRs, these are useful in analysis of genetic diversity due to their greater efficiency as opposed to genomic SSRs. Low GC content is a significant feature of plastidic genomes, which is possibly formed after endosymbiosis by DNA replication and repair.

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