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Complete chloroplast genomes of three sand-fixing Salix shrubs from Northwest China: comparative and phylogenetic analysis and interspecific identification

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By comparing the chloroplast genomes of three willows, it is found that the genome structure is relatively conservative, and the large variations are more derived from the noncoding regions.

Abstract

Salix L., the largest genus in Salicaceae, has great value in ecology and economy. Here, we compared the chloroplast genomes of three important sand-fixing shrubs of the genus Salix: Salix gordejevii (size: 155,279 bp); S. cheilophila (size: 155,322 bp); and S. psammophila (size: 155,278 bp). The quadripartite circular structures of these genome sequences have the same structure and gene contents with 84 protein-coding genes, 38 tRNA genes, and eight rRNA genes. Long repeats including forward and palindromic repeats were found in three plastomes. The mononucleotide simple sequence repeats (SSRs) were dominant and accounted for more than 64% in all three plastomes, whereas hexanucleotide SSRs existed only in S. gordejevii. The noncoding and intergenic regions have greater variations than the coding regions, and eight highly variable regions were identified within the Salix chloroplast genomes, which could be utilized as potential markers for phylogenetic studies and phylogeography. In addition, we found 34 indels with more than 5 bases, which can be used to further identify S. gordejevii and S. psammophila with similar morphologies. Phylogenetic analysis based on whole cp genomes showed that S. gordejevii and S. magnifica are closely related, S. psammophila was a sister to S. suchowensis, and S. cheilophila clustered with them. The completed genomes in this study provide useful genetic resources for future research on species identification, phylogenetic relationships, and the adaptive evolution of Salix species.

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The datasets used or analyzed during the current study are available from the corresponding author upon reasonable request.

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Funding

This study was funded by the Inner Mongolia Autonomous Region Natural Science Fund Project of China (grant number: 2018MS03013) and by the National Natural Science Foundation of China (grant number: 31160167).

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Correspondence to Guosheng Zhang.

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Written informed consent for publication was obtained from all participants.

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Communicated by K. Braeutigam.

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Supplementary Information

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468_2023_2388_MOESM1_ESM.pdf

Supplementary file1 Figure S1: Amino acid frequencies of the protein-coding sequences of the three Salix plastomes. (PDF 45 KB)

468_2023_2388_MOESM2_ESM.pdf

Supplementary file2 Figure S2: Nucleotide diversity (pi) values of coding regions in the whole plastomes of six Salix species. (PDF 149 KB)

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Supplementary file3 Figure S3: Nucleotide diversity (pi) values of non-coding regions in the whole plastomes of six Salix species. (PDF 231 KB)

Supplementary file4 Figure S4: Phylogenetic trees of 29 Salicaceae species based on the LSC dataset. (PDF 145 KB)

Supplementary file5 Figure S5: Phylogenetic trees of 29 Salicaceae species based on the SSC dataset. (PDF 145 KB)

Supplementary file6 Figure S6: Phylogenetic trees of 29 Salicaceae species based on the IR dataset. (PDF 146 KB)

Supplementary file7 Figure S7: Phylogenetic trees of 29 Salicaceae species based on the LSC+SSC dataset. (PDF 144 KB)

468_2023_2388_MOESM8_ESM.pdf

Supplementary file8 Figure S8: Phylogenetic trees of 29 Salicaceae species based on the protein-coding genes (single-copy) dataset. (PDF 146 KB)

Supplementary file9 Table S1: The species accessions used in this study for phylogeny. (XLS 22 KB)

Supplementary file10 Table S2. The number of SSR types in three Salix cp genomes. (XLSX 11 KB)

468_2023_2388_MOESM11_ESM.xlsx

Supplementary file11Table S3. The RSCU value in S. gordejevii, S. cheilophila and S. psammophila plastomes. (XLSX 14 KB)

Supplementary file12 Table S4. Indels used for distinguish Salix gordejevii and Salix psammophila.(XLSX 13 KB)

Supplementary file13 Table S5. The Ka/Ks value of six Salix species. (XLSX 12 KB)

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Lu, D., Huang, H., Zhang, L. et al. Complete chloroplast genomes of three sand-fixing Salix shrubs from Northwest China: comparative and phylogenetic analysis and interspecific identification. Trees 37, 849–861 (2023). https://doi.org/10.1007/s00468-023-02388-3

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  • DOI: https://doi.org/10.1007/s00468-023-02388-3

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