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

小行星9411538 研究生乔安娜·舒尔茨在华盛顿州立大学的教师顾问帕梅拉·索尔蒂斯的指导下，正在研究福禄考科的两个相关属，纤指花和亚麻花。 这两个提出的机会，以对比植物物种形成的替代过程，无论是同域/parapatric通过多倍体（无论是否以下杂交）和异域，通常通过分散和隔离的小周边人口。 形态学和分子证据，后者包括广泛的数据，叶绿体DNA和蛋白质同工酶，将收购推断物种之间的系统发育关系，并评估可能的起源路线，通过分析模式的遗传变异密切相关的物种。 基于形态学和分子证据相结合的密切相关的物种的系统发育分析，提供了最强有力的测试案例，用于评估植物物种形成的对比机制的相对重要性，无论是通过多倍体进化（通常涉及同域同源物的杂交）还是通过地理物种形成（异地分歧）。

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).