PEET: A Unified Approach to Systematics of Basal Streptophytes (Charophycean Green Algae)

9978117 Delwiche轮藻科是一类被认为与陆地植物非常密切相关的绿色藻类。 由于轮藻科与陆生植物的密切关系，了解轮藻科内部的关系和多样性对于了解陆生植物的起源和早期进化是很重要的。 这些藻类的知识提供了所需的信息，以确定适当的模型系统的研究ofundamental植物的属性和指导这些藻类和offshwater环境的研究一般。 尽管轮藻门藻类在进化上具有重要意义，但它们在一个单一类群中的分类直到最近才被认识到，而且这个类群从未在一个单一的分类学研究中被考察过。 该项目旨在提供轮藻科的单一、统一的分类学处理方法，并对学生进行分类学方法和该类群生物多样性方面的培训。 轮藻科有五个目，每个目都有一套独特的分类问题。 鞘毛目是一种显微镜下观察到的、结构复杂的藻类，至今尚未得到详细的分类学研究，也没有已知的化石记录。在这一组中需要一个完整的分类学处理。轮藻目体型大，复杂性与鞘毛目相当，并且有广泛的化石记录。 这一类群已经得到了详细的分类学处理，但分类需要用现代系统发育方法的信息进行更新。 双星藻目是一类常见的丝状藻类，对环境具有重要意义。 这一群在该目所有属中需要一个统一的分类学处理。最后，Klebsormidiales和Chlorokybales是知之甚少的丝状或成包藻类，在自然界中很难识别。 现代方法将被用来调查这些群体内的自然多样性，并确定以前未知的群体成员。 该项目将为一名访问学者，大约五名研究生和十名本科生提供培训。 这项研究的信息将通过万维网、学术文章和分类学指南的出版物提供，并将存入档案库。

9978117 DelwicheThe Charophyceae are a class of green algae that are thought to be veryclosely related to land plants. Because of this close relationship to landplants, an understanding of the relationships and diversity of form withinthe Charophyceae is important to the understanding of the origin and earlyevolution of land plants. Knowledge of these algae provides theinformation needed to identify appropriate model systems for the study offundamental plant properties and guides the study of these algae and offreshwater environments in general. Despite the evolutionary importance ofcharophycean algae, their classification within a single group has beenrecognized only recently, and the group has never been examined in a singletaxonomic study. This project is intended to provide a single, unifiedtaxonomic treatment of the Charophyceae, and to train students in taxonomicmethods and in the biological diversity of the group. There are fiveorders within the Charophyceae, and each has a distinctive set of taxonomicproblems. The Coleochaetales are microscopic, but structurally complexalgae that have never received detailed taxonomic study, and have no knownfossil record. In this group a complete taxonomic treatment is required.The Charales are large in size, are comparable in complexity to theColeochaetales, and have an extensive fossil record. This group hasreceived detailed taxonomic treatment, but the classification needs to beupdated with information from modern phylogenetic methods. TheZygnematales are a large group of common and environmentally importantfilamentous algae. This group is in need of a uniform taxonomic treatmentamong all of the genera in the order. Finally, the Klebsormidiales andChlorokybales are poorly understood filamentous or packet-forming algaethat are very difficult to identify in nature. Modern methods will be usedto survey natural diversity within these groups and identify previouslyunknown members of the group. The project will provide training to onevisiting scholar, approximately five graduate students, and tenundergraduates. Information from the study will be made available via theworld wide web, by publication of scholarly articles and taxonomic guides,and will be placed in archival storage.