Dissertation Research: Phylogeny and Character Evolution in the Genus Sphaerocardamum (Brassicaceae)

小行星9701007 研究生卡尔·贝利在康奈尔大学杰夫·道尔教授的指导下，正在研究墨西哥的芥子科属Sphaerocardamum，以改进该组的分类学分类，构建八个已知物种的系统发育，并探索花发育基因的变异。 在墨西哥进行的额外实地收集将增加从实地和植物标本馆收集的材料。 核和叶绿体基因DNA测序的新分子数据将为系统发育分析提供证据，这些数据可以与传统的形态特征相结合，用于界定物种，评估同域区的杂交，以及研究该组的历史地理。 来自拟南芥模式系统的基因探针，在家庭中的相关植物，将被用来探索影响花发育和其他功能区分相关物种的基因的变化。 该项目的意义包括对芥菜科（芥菜）家族的分类学和系统发生学的贡献，对Sphaerocardamum属及其近亲中关键形态特征的可靠性和稳定性的评估，开发用于系统发育重建的新的DNA数据源，以及利用拟南芥模型系统的探针探索影响花发育的基因变异。

9701007 Doyle Graduate student Carl Bailey, under the direction of Professor Jeff Doyle at Cornell University, is studying the mustard-family genus Sphaerocardamum of Mexico, to improve taxonomic classification of the group, construct a phylogeny of the eight or so known species, and explore variation in floral development genes. Additional field collecting in Mexico will augment materials assembled from the field and herbarium. New molecular data from DNA sequencing of both nuclear and chloroplast genes will provide evidence for phylogenetic analyses, and these data can be combined with traditional morphological characters in delimiting species, assessing hybridization in areas of sympatry, and studying the historical biogeography of the group. Gene probes from the Arabidopsis model system, a related plant in the family, will be used to explore variation in genes affecting floral development and other features distinguishing related species. The significance of the project includes contributions to the taxonomy and phylogeny of the Brassicaceae (mustard) family, evaluation of the reliability and stability of key morphological characters in the genus Sphaerocardamum and close relatives, the development of new sources of DNA data for phylogenetic reconstruction, and the exploration of variation in genes affecting flower development, making use of probes from the Arabidopsis model system.