Genetic adaptation of Tibetan poplar ( Populus szechuanica var. tibetica ) to high altitudes on the Qinghai–Tibetan Plateau
| Autor: | Meixia Ye, Chenfei Zheng, Rongling Wu, Mengmeng Sang, Lizhi Tan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Population adaptation Biology 010603 evolutionary biology 01 natural sciences Gene flow 03 medical and health sciences Tibetan poplar Genetic variation education Genotyping Gene QH540-549.5 Ecology Evolution Behavior and Systematics 030304 developmental biology Nature and Landscape Conservation 0303 health sciences education.field_of_study Ecology Abiotic stress genetic loci Populus szechuanica Evolutionary biology gene flow population genetic variation Genetic adaptation |
| Zdroj: | Ecology and Evolution, Vol 10, Iss 20, Pp 10974-10985 (2020) |
| ISSN: | 2045-7758 |
| DOI: | 10.1002/ece3.6508 |
| Popis: | Plant adaptation to high altitudes has long been a substantial focus of ecological and evolutionary research. However, the genetic mechanisms underlying such adaptation remain poorly understood. Here, we address this issue by sampling, genotyping, and comparing populations of Tibetan poplar, Populus szechuanica var. tibetica, distributed from low (~2,000 m) to high altitudes (~3,000 m) of Sejila Mountain on the Qinghai–Tibet Plateau. Population structure analyses allow clear classification of two groups according to their altitudinal distributions. However, in contrast to the genetic variation within each population, differences between the two populations only explain a small portion of the total genetic variation (3.64%). We identified asymmetrical gene flow from high‐ to low‐altitude populations. Integrating population genomic and landscape genomic analyses, we detected two hotspot regions, one containing four genes associated with altitudinal variation, and the other containing ten genes associated with response to solar radiation. These genes participate in abiotic stress resistance and regulation of reproductive processes. Our results provide insight into the genetic mechanisms underlying high‐altitude adaptation in Tibetan poplar. |
| Databáze: | OpenAIRE |
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