Variation in Mutation Rate and Polymorphism Among Mitochondrial Genes of Silene vulgaris

摘要: The prevailing wisdom of the plant mitochondrial genome is that it has very low substitution rates, thus generally assumed nucleotide diversity within species will also be low. However, recent evidence suggests genes may harbor variable and sometimes high levels within-species polymorphism, a result attributed to variance in influence selection. insufficient attention been paid effect among-gene variation mutation rate on varying polymorphism across loci. We measured seven gene regions geographically wide sample Silene vulgaris investigate whether individual accumulate polymorphisms equally. found vary significantly polymorphism. Tests based coalescence theory show their scaled rate, which, absence differences among effective population size, these underlying rate. Further due comes from significant positive relationship between number segregating sites silent site divergence an outgroup. Contrary studies, we unconvincing recombination genome, confirm standard model mitochondria characterized by rates no recombination. strength or direction selection genes; this expected if there present study provides some most thorough data compelling for genes. demonstrates difficulty establishing null difficulty, comparative approach, testing assumption lead