Dissertation Research: Evolution in Linanthus and Leptodactylon (Polemoniaceae): Phylogenetic Relationships and Speciation Processes

9411538索尔蒂斯研究生乔安娜·舒尔茨在华盛顿州立大学教师顾问帕梅拉·索尔蒂斯的指导下，正在研究福禄克属中的两个近缘属，即细竹属和莲子属。这两者提供了对比植物物种形成的不同过程的机会，无论是通过多倍体的共生/共生的(无论是否在杂交之后)，还是通过异地的，通常是通过分散和隔离小的外围种群。将获得形态和分子证据，包括来自叶绿体DNA和蛋白质同工酶的大量数据，以推断物种之间的系统发育关系，并通过分析密切相关物种的遗传变异模式来评估可能的起源路线。以形态和分子证据为基础的对密切相关物种的强有力的系统发育分析，为评估植物物种形成的对比机制的相对重要性提供了最有力的测试案例，无论是通过多倍体进化(通常涉及共域同源物的杂交)还是通过地理物种形成(异地分化)。

9411538 Soltis Graduate student Joanna Schultz, under the supervision of faculty adviser Pamela Soltis at Washington State University, is studying two related genera in the phlox family Polemoniaceae, Leptodactylon and Linanthus. The two present opportunities to contrast alternative processes of speciation in plants, either sympatric/parapatric through polyploidy (whether following hybridization or not) and allopatric, usually through dispersal and isolation of small peripheral populations. Morphological and molecular evidence, the latter including extensive data from chloroplast DNA and from protein isozymes, will be acquired to infer phylogenetic relationships among species and to assess likely routes of origin by analyzing patterns of genetic variation in closely related species. Robust phylogenetic analysis of closely related species, based on combined morphological and molecular evidence, provides the strongest test cases for assessing the relative importance of contrasting mechanisms of plant speciation, whether through polyploid evolution (usually involving hybridization of sympatric congeners) or through geographic speciation (allopatric divergence).