基于GIS的青藏高原地区四种高山植物的空间遗传格局

Spatial genetic patterns of four alpine plants in Tibetan Plateau based on GIS

青藏高原地区景观特征影响着高山植物的现代遗传格局。基于叶绿体DNA(cpDNA)变异数据,运用GIS空间插值方法和Monmonier算法,分析了青藏高原地区4种高山植物长花马先蒿(Pedicularis longiflora)、西川红景天(Rhodiola alsia)、窄叶鲜卑花(Sibiraea angustata)和西藏沙棘(Hippophae tibetana)的遗传多样性和遗传分化景观格局。结果表明:在4种高山植物的遗传景观格局中,高值区域主要位于东喜马拉雅-横断山脉地区,每种植物的地理隔离也位于这个地区;Partial Mantel test检测表明,地理隔离均显著影响4种植物种群的基因交流,验证了长期地理隔离造成的种群分化是产生该地区遗传格局的主要原因。

The rapid uplift of Tibetan Plateau and climatic oscillations of the Quaternary dramat- ically shaped contemporary genetic patterns of alpine plants in Tibetan Plateau. The genetic di- versity and divergence landscape patterns and the identified geographical isolation of four species containing Pedicularis longiflora, Rhodiola alsia, Sibiraea angustata and Hippophae tibetana were attained using the spatial interpolation method and Monmonier＇ s algorithm based on epDNA vari- ation. The results showed that the high genetic diversity and divergence areas were mainly high- lighted within East Himalayas-Hengduan Mountains （HHM） region. The geographical isolation of each species was also found within the HHM region. Partial Mantel test showed that the geo- graphical isolation had significant influence on gene flow between populations of the four species. These results verified that long-term geographical isolation resulted in high genetic divergence and diversity patterns in HHM region.