| 项目编号 | PRJCA015481 | ||||||||||
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| 项目标题 | Whole-genome duplication and molecular evolution in Cornus L. (Cornaceae) - Insights from transcriptome sequences | ||||||||||
| 涉及领域 | Evolution | ||||||||||
| 数据类型 |
Transcriptome or Gene expression
Raw sequence reads |
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| 物种名称 |
Cornus officinalis
Cornus capitata Cornus kousa Hydrangea febrifuga Cornus florida Cornus alternifolia Alangium chinense Cornus canadensis Cornus elliptica Cornus controversa |
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| 描述信息 | The pattern and rate of genome evolution have profound consequences in organismal evolution. Whole-genome duplication (WGD), or polyploidy, has been recognized as an important evolutionary mechanism of plant diversification. However, in non-model plants the molecular signals of genome duplications have remained largely unexplored. High-throughput transcriptome data from next-generation sequencing have set the stage for novel investigations of genome evolution using new bioinformatic and methodological tools in a phylogenetic framework. Here we compare ten de novo-assembled transcriptomes representing the major lineages of the angiosperm genus Cornus (dogwood) and relevant outgroups using a customized pipeline for analyses. Using three distinct approaches, molecular dating of orthologous genes, analyses of the distribution of synonymous substitutions between paralogous genes, and examination of substitution rates through time, we detected a shared WGD event in the late Cretaceous across all taxa sampled. The inferred doubling event coincides temporally with the paleoclimatic changes associated with the initial divergence of the genus into three major lineages. Analyses also showed an acceleration of rates of molecular evolution after WGD. The highest rates of molecular evolution were observed in the transcriptome of the herbaceous lineage, C. canadensis, a species commonly found at higher latitudes, including the Arctic. Our study demonstrates the value of transcriptome data for understanding genome evolution in closely related species. The results suggest dramatic increase in sea surface temperature in the late Cretaceous may have contributed to the evolution and diversification of flowering plants. | ||||||||||
| 样品范围 | Multispecies | ||||||||||
| 发布日期 | 2023-03-11 | ||||||||||
| 出版信息 |
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| 项目资金来源 |
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| 提交者 | zhen zhang (zzhen0302@163.com) | ||||||||||
| 提交单位 | Sichuan University | ||||||||||
| 提交日期 | 2023-03-11 |