中国淡水舟形藻类（naviculoid）硅藻系统分类研究

舟形藻（naviculoid）是硅藻植物中的一个重要类群，在硅藻植物的系统演化中占有重要位置。该类群形态多样，种类繁多，截至目前，世界已报道该类群10000余种，其属内种间变化极为复杂，各类群分类地位的确立与归属长期以来也存在颇多争议，是硅藻植物分类学和系统学领域的研究热点和难点。本项目拟对我国舟形藻类硅藻进行深入系统的分类学研究，在扩大研究范围和标本采集量的基础上，利用不同的研究手段对该类群进行显微结构特征、超微结构特征的研究，筛选稳定有效的形态分类特征，建立完善的形态学数据库和图像资料库，提出种类鉴定特征的确定化标准；同时利用基因序列分析等分子生物学技术开展分子系统学研究，构建基于多基因的系统进化树，综合形态学和分子生物学的研究结论，确定该类群属间、种间的分类依据和分类标准，提炼各个类群的共同特征，对现有淡水舟形藻类硅藻的分类系统进行修订和完善，明确该类群在硅藻系统进化中的地位和作用。

As one of the most important group in Bacillariphyta, naviculoid diatoms play a very important role in the evolution of diatoms. The biodiversity of this group is very abundant, until now, more than 10000 taxa were reported. Due to the large population, the differences between the species within one genus are very complex, the position of some group are controversial, the systematic position of some group are the research hotpot in the taxonomical and systematical study. The purpose of this project is to do the taxonomical study deeply of naviculoid group, based on the increase research area and quantity of samples, kinds of research methods will be used to study the microstructure and ultrastructure, the stable features will be chosen, and database of morphology and images will be established, standard the identification characters; molecular technology will be used to study the molecular phylogeny, built the evolutionary tree, combine the results of morphological and molecular researches to determine the taxonomical evidence and standard among genera and species, document the general characters of all these groups to revise and complete the classification scheme, clear the status and role of this group in the evolutionary history of diatom.