科研之友
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摘要
The chloroplast genome is mainly inherited from the maternal genome and is characterized by a small genome size, simple structure, and conserved sequence composition. In the present study, using systematic bioinformatics methods, comparative genomic studies of chloroplast genome sequences of four Chenopodium species were performed, focusing on gene content, genome structure, repeat sequences, and variable sites. The average size of complete chloroplast genomes in the four Chenopodium species was 151 936 bp, with an average GC content of 37.16%. There was little difference in the specific gene copy number and total gene number in the four species. Except for C. glaucum, the border regions between the inverted repeat (IR) region and the large and small single-copy (LSC and SSC, respectively) regions of the other three species were the same, showing no obvious expansion or contraction. There were more long repeat sequences than simple sequence repeat (SSR) sequences. Compared with the IR regions, the LSC and SSC regions contained more divergent nucleotide sites. The most divergent nucleotide sequence region among the four species was the 52–59 kb genomic region. Based on whole-genome sequences and LSC and SSC region sequences, a phylogenetic tree of Chenopodioidea was constructed, showing consistent relationships. Our results demonstrate the characteristics of the chloroplast genomes of Chenopodium species and provide molecular markers for phylogenetic relationships in Chenopodioidea.
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