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The complete plastome of Primula wilsonii, a heterostylous ornamental species.

ABSTRACT: Primula wilsonii Dunn is a perennial herb in section Proliferae Pax of Primula L. with small population sizes in the field. Here, we constructed the complete plastome of the P. wilsonii using Illumina sequencing technology. The circular plastome was 151,677 bp in size, and comprises a large single-copy (LSC) region of 83,510 bp, a small single-copy (SSC) region of 17,765 bp, and a pair of inverted repeats (IR) of 25,201 bp. The GC content was 36.99% overall, with 34.89%, 30.18%, and 42.87% for the LSC, SSC, and IR regions, respectively. The plastome comprised 130 unique genes including 84 protein-coding genes, 37 tRNAs, and 8 rRNAs. The ML phylogenetic analysis based on 17 plastomes in Primulaceae showed a strong sister relationship with P. anisodora in section Proliferae.

SUBMITTER: Xie Y

PROVIDER: S-EPMC8043557 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature

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The complete plastome of Primula wilsonii, a heterostylous ornamental species.

Xie Yanping Y Zhang Xingwang X Jiang Xianfeng X Yang Ganggang G

Mitochondrial DNA. Part B, Resources 20210408 4

Primula wilsonii Dunn is a perennial herb in section Proliferae Pax of Primula L. with small population sizes in the field. Here, we constructed the complete plastome of the P. wilsonii using Illumina sequencing technology. The circular plastome was 151,677 bp in size, and comprises a large single-copy (LSC) region of 83,510 bp, a small single-copy (SSC) region of 17,765 bp, and a pair of inverted repeats (IR) of 25,201 bp. The GC content was 36.99% overall, with 34.8 ...[more]

PMID: 33889739

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Project description:BackgroundPrimula species are important early spring garden plants with a centre of diversity and speciation in the East Himalaya-Hengduan Mountains in Western China. Studies on population genetics, speciation and phylogeny of Primula have been impeded by a lack of genomic resources. In the present study, we sequenced the transcriptomes of two closely related primrose species, Primula poissonii and Primula wilsonii, using short reads on the Illumina Genome Analyzer platform.ResultsWe obtained 55,284 and 55,011 contigs with N50 values of 938 and 1,085 for P. poissonii and P. wilsonii, respectively, and 6,654 pairs of putative orthologs were identified between the two species. Estimations of non-synonymous/synonymous substitution rate ratios for these orthologs indicated that 877 of the pairs may be under positive selection (Ka/Ks > 0.5), and functional enrichment analysis revealed that significant proportions of the orthologs were in the categories DNA repair, stress resistance, which may provide some hints as to how the two closely related Primula species adapted differentially to extreme environments, such as habitats characterized by aridity, high altitude and high levels of ionizing radiation. It was possible for the first time to estimate the divergence time between the radiated species pair, P. poissonii and P. wilsonii; this was found to be approximately 0.90 ± 0.57 Mya, which falls between the Donau and Gunz glaciation in the Middle Pleistocene. Primers based on 54 pairs of orthologous SSR-containing sequences between the two Primula species were designed and verified. About half of these pairs successfully amplified for both species. Of the 959 single copy nuclear genes shared by four model plants (known as APVO genes), 111 single copy nuclear genes were verified as being present in both Primula species and exon-anchored and intron-spanned primers were designed for use.ConclusionWe characterized the transcriptomes for the two Primula species, and produced an unprecedented amount of genomic resources for these important garden plants. Evolutionary analysis of these two Primula species not only revealed a more precise divergence time, but also provided some novel insights into how differential adaptations occurred in extreme habitats. Furthermore, we developed two sets of genetic markers, single copy nuclear genes and nuclear microsatellites (EST-SSR). Both these sets of markers will facilitate studies on the genetic improvement, population genetics and phylogenetics of this rapidly adapting taxon.

Dataset Information

The complete plastome of Primula wilsonii, a heterostylous ornamental species.

Publications

The complete plastome of <i>Primula wilsonii</i>, a heterostylous ornamental species.

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