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Complete chloroplast genome sequences of six lines of Echinochloa colona (L.) link.

ABSTRACT: Barnyard grass (Echinochloa colona, (L.) Link) is the wild relative of barnyard millet (E. frumentacea (Roxb.) Link). This species, widely distributed globally, is an agricultural weed and has developed resistance to several herbicides including glyphosate. This paper presents the complete chloroplast sequences of two haplotypes (139,718 bp & 139,719 bp) sequenced from six lines of E. colona from Australia. The E. colona chloroplast sequence is very similar to that of E. frumentacea (163-169bp =0.12% differences across the genome). The gene content, arrangement, and the inverted repeat structure is the same as in the other species of Echinochloa sequenced to date.

SUBMITTER: Hereward JP

PROVIDER: S-EPMC7799531 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature

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Complete chloroplast genome sequences of six lines of Echinochloa colona (L.) link.

Hereward James P JP Werth Jeff A JA Thornby David F DF Keenan Michelle M Chauhan Bhagirath Singh BS Walter Gimme H GH

Mitochondrial DNA. Part B, Resources 20170109 1

Barnyard grass (Echinochloa colona, (L.) Link) is the wild relative of barnyard millet (E. frumentacea (Roxb.) Link). This species, widely distributed globally, is an agricultural weed and has developed resistance to several herbicides including glyphosate. This paper presents the complete chloroplast sequences of two haplotypes (139,718 bp & 139,719 bp) sequenced from six lines of E. colona from Australia. The E. colona chloroplast sequence is very similar to that of ...[more]

PMID: 33473687

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Project description:BackgroundPolystachya Hook. is a large pantropical orchid genus (c. 240 species) distributed in Africa, southern Asia and the Americas, with the center of diversity in Africa. Previous studies on species of this genus have not obtained the complete chloroplast genomes, structures and variations. Additionally, the phylogenetic position of the genus in the Orchidaceae is still controversial and uncertain. Therefore, in this study, we sequenced the complete plastomes of six Kenya Polystachya species based on genome skimming, subjected them to comparative genomic analysis, and reconstructed the phylogenetic relationships with other Orchidaceae species.ResultsThe results exhibited that the chloroplast genomes had a typical quadripartite structure with conserved genome arrangement and moderate divergence. The plastomes of the six Polystachya species ranged from 145,484 bp to 149,274 bp in length and had an almost similar GC content of 36.9-37.0%. Gene annotation revealed 106-109 single-copy genes. In addition, 19 genes are duplicated in the inverted regions, and 16 genes each possessd one or more introns. Although no large structural variations were observed among the Polystachya plastomes, about 1 kb inversion was found in Polystachya modesta and all 11 ndh genes in the Polystachya plastomes were lost or pseudogenized. Comparative analysis of the overall sequence identity among six complete chloroplast genomes confirmed that for both coding and non-coding regions in Polystachya, SC regions exhibit higher sequence variation than IRs. Furthermore, there were various amplifications in the IR regions among the six Polystachya species. Most of the protein-coding genes of these species had a high degree of codon preference. We screened out SSRs and found seven relatively highly variable loci. Moreover, 13 genes were discovered with significant positive selection. Phylogenetic analysis showed that the six Polystachya species formed a monophyletic clade and were more closely related to the tribe Vandeae. Phylogenetic relationships of the family Orchidaceae inferred from the 85 chloroplast genome sequences were generally consistent with previous studies and robust.ConclusionsOur study is the initial report of the complete chloroplast genomes of the six Polystachya species, elucidates the structural characteristics of the chloroplast genome of Polystachya, and filters out highly variable sequences that can contribute to the development of DNA markers for use in the study of genetic variability and evolutionary studies in Polystachya. In addition, the phylogenetic results strongly support that the genus of Polystachya is a part of the tribe Vandeae.

Dataset Information

Complete chloroplast genome sequences of six lines of Echinochloa colona (L.) link.

Publications

Complete chloroplast genome sequences of six lines of <i>Echinochloa colona</i> (L.) link.

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