MtDNA and CpDNA Sequence Variation in Limber Pine and Ponderosa Pine

Mitton9983151进化和保护生物学家用一种新的技术，一种地理分析，或一种地理学来研究一个物种的地理变异。该技术将种群间遗传距离的估计与其地理位置相结合，以更好地了解种群间的历史关系。系统地理学研究通常用于动物研究，但很少用于植物研究。植物线粒体DNA的低突变率最大限度地减少了复杂地理所需的序列变异。这项研究是调查足够的线粒体和叶绿体DNA序列的变异，进行limber pine和ponderosa pin.Conifers的地理学研究提供了一个令人兴奋的机会，为他们的线粒体和叶绿体有不同的遗传模式，因此，显着不同的潜力，为传播的地理学研究。在松树中，母系遗传的mtDNA具有很低的扩散潜力，而父系遗传的cpDNA具有很高的扩散潜力。基因流动的不同潜力预计将产生截然不同的地理区域。线粒体线粒体的地理学应该提供一个古老的历史事件，如冰川避难所隔离的指示。叶绿体叶绿体地理学应提供深入了解花粉流的规模在人口之间的今天和最近的过去。

Mitton9983151Evolutionary and conservation biologists study the geographic variation within a species with a new technique, a phylogeographic analysis, or a phylogeography. This technique combines estimates of genetic distances among populations with their geographic positions to better understand the historical relationships among the populations. Phylogeographic studies are commonly used in studies of animals, but rarely in plants. The low mutation rate of plant mitochondrial DNA minimizes the sequence variation needed for a phylogeography. The proposed research is a survey for sufficient mitochondrial and chloroplast DNA sequence variation to conduct phylogeographies of limber pine and ponderosa pine.Conifers present an exciting opportunity for phylogeographic studies, for their mitochondria and chloroplasts have different patterns of inheritance and, consequently, drastically different potentials for dispersal. In the pines, the maternally inherited mtDNA has very low potential for dispersal, while the paternally inherited cpDNA has high potential for dispersal. The disparate potentials for gene flow are expected to produce dramatically different phylogeographies. The mitochondrial phylogeography should provide an indication of ancient historical events, such as isolation in glacial refugia. The chloroplast phylogeography should provide insights into the magnitude of pollen flow among populations today and in the recent past.