Analysis of Ultrastructural Characters in the Systematics ofOomycetes

卵菌纲是一种真菌类生物，在水生和潮湿的栖息地中非常重要，它们会分解有机物并寄生于藻类、真菌、植物、昆虫和甲壳类动物。尽管它们的重要性，目前用于显示系统发育关系和分类这些生物的许多字符是不稳定的，在不同的环境条件下。本项目将利用超微结构特征建立一个新的稳定性状库，然后利用该数据库建立一个新的分类单元内和分类单元内的系统发育模型，并修订其分类。角色基础将集中在运动的无性孢子上。一旦完成，PI将转向对丝囊酵母属的分析。较大类群和属的系统发育分析将使用基于外类群转换序列极化的简约分析。

Oomycetes are fungal-like organisms that are important in aquatic and moist habitats where they decay organic matter and parasitize algae, fungi, plants, insects, and crustacea. Despite their importance, many characters currently used to show phylogenetic relationship and to classify these organisms are not stable under different environmental conditions. This project will use ultrastructural features to develop a new base of stable characters and then to use that data base to develop a new model of phylogeny, both of and within the taxon, and to revise their classification. The character base will focus on motile, asexual spores. Once completed the PI will turn to an analysis of the genus Aphanomyces. The phylogenetic analysis of the larger group and the genus will use parsimony analysis based on polarization of transformation series using out-groups.