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The complete chloroplast genome of the Crataegus kansuensis (Rosaceae): characterization and phylogeny.

ABSTRACT: Crataegus kansuensis Wils. is an important wild eco economical species of the family Rosaceae. The complete chloroplast genome reported here is 159,865 bp in length, including two inverted repeats (IRs) of 26,384 bp, which are separated by a large single-copy (LSC) and a small single-copy (SSC) of 87,815 bp and 19,282 bp, respectively. The whole chloroplast genome of C. kansuensis contains 113 genes, including 79 protein-coding genes, 30 transfer RNA, and 4 ribosome RNA. Phylogenetic analysis indicated that C. kansuensis is closely related to that of C. chungtienensis and C. marshallii, and the genus Crataegus L. was sister to the genus Amelanchier Medik.

SUBMITTER: Zhang X

PROVIDER: S-EPMC7782147 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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The complete chloroplast genome of the Crataegus kansuensis (Rosaceae): characterization and phylogeny.

Zhang Xiaobo X Wang Yiheng Y Wang Mengli M Yuan Qingjun Q Huang Luqi L

Mitochondrial DNA. Part B, Resources 20200720 3

Crataegus kansuensis Wils. is an important wild eco economical species of the family Rosaceae. The complete chloroplast genome reported here is 159,865 bp in length, including two inverted repeats (IRs) of 26,384 bp, which are separated by a large single-copy (LSC) and a small single-copy (SSC) of 87,815 bp and 19,282 bp, respectively. The whole chloroplast genome of C. kansuensis contains 113 genes, including 79 protein-coding genes, 30 transfer RNA, and 4 ribosome RNA. Phylogenet ...[more]

PMID: 33458002

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Project description:BackgroundHawthorn species (Crataegus L.; Rosaceae tribe Maleae) form a well-defined clade comprising five subgeneric groups readily distinguished using either molecular or morphological data. While multiple subsidiary groups (taxonomic sections, series) are recognized within some subgenera, the number of and relationships among species in these groups are subject to disagreement. Gametophytic apomixis and polyploidy are prevalent in the genus, and disagreement concerns whether and how apomictic genotypes should be recognized taxonomically. Recent studies suggest that many polyploids arise from hybridization between members of different infrageneric groups.MethodsWe used target capture and high throughput sequencing to obtain nucleotide sequences for 257 nuclear loci and nearly complete chloroplast genomes from a sample of hawthorns representing all five currently recognized subgenera. Our sample is structured to include two examples of intersubgeneric hybrids and their putative diploid and tetraploid parents. We queried the alignment of nuclear loci directly for evidence of hybridization, and compared individual gene trees with each other, and with both the maximum likelihood plastome tree and the nuclear concatenated and multilocus coalescent-based trees. Tree comparisons provided a promising, if challenging (because of the number of comparisons involved) method for visualizing variation in tree topology. We found it useful to deploy comparisons based not only on tree-tree distances but also on a metric of tree-tree concordance that uses extrinsic information about the relatedness of the terminals in comparing tree topologies.ResultsWe obtained well-supported phylogenies from plastome sequences and from a minimum of 244 low copy-number nuclear loci. These are consistent with a previous morphology-based subgeneric classification of the genus. Despite the high heterogeneity of individual gene trees, we corroborate earlier evidence for the importance of hybridization in the evolution of Crataegus. Hybridization between subgenus Americanae and subgenus Sanguineae was documented for the origin of Sanguineae tetraploids, but not for a tetraploid Americanae species. This is also the first application of target capture probes designed with apple genome sequence. We successfully assembled 95% of 257 loci in Crataegus, indicating their potential utility across the genera of the apple tribe.

Dataset Information

The complete chloroplast genome of the Crataegus kansuensis (Rosaceae): characterization and phylogeny.

Publications

The complete chloroplast genome of the <i>Crataegus kansuensis</i> (Rosaceae): characterization and phylogeny.

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