Re-examination of the Algal Class Chrysophyceae Using Gene Sequences and Electron Microscopy

9419498安徒生是世界上的淡水和海洋藻类，是一类重要的光合作用生物，通常用植物和真菌进行植物学研究。在海洋中，它们为海洋动物提供主要食物。金藻是一类以金色为特征的藻类(由于光合色素和贮藏化合物)；尽管它们的外部形态简单，但它们在生理和超微结构上是多样化的。在过去的三十年里，积极的海洋探索以及随后的电子显微镜和分子生物学的实验室研究表明，在以前的研究中，许多不寻常的金藻被错误分类或干脆遗漏了。此外，最初的金藻分类反映出需要一种简单的鉴定办法，强调用光学显微镜可以观察到的鞭毛和其他外部细胞壁特征，这些特征现在被怀疑是适应开阔海洋条件的汇聚进化的实例。毕格罗实验室的Robert Andersen博士和他的同事将研究来自大西洋、太平洋和印度洋探险的新金藻标本，重点是精细内部特征的电子显微镜和基因测序。DNA数据将从单个菌株的核基因组和叶绿体基因组中积累起来。对金藻进行现代和可靠的系统分类将有利于海洋生态、生物多样性、水产养殖和海洋生物技术领域的工作人员。?？

9419498 Andersen The world's freshwater and marine algae are an important group of photosynthetic organisms, usually studied botanically with plants and fungi. In the oceans they provide the primary food for marine animals. The Chrysophyceae are one group of algae characterized by their golden color (due to photosynthetic pigments and storage compounds); despite their simple external morphology, they are diverse physiologically and ultrastructurally. Over the last three decades, active oceanographic exploration followed by laboratory studies in electron microscopy and molecular biology have shown that numerous unusual chrysophytes were misclassified or simply missed in previous studies. Furthermore, the original classification of chrysophytes, reflecting a need for a simple identification scheme, placed emphasis on flagella and other external cell wall characters observable with light microscopy, features that are now suspected to represent instances of convergent evolution in adapting to open-ocean conditions. Dr. Robert Andersen of the Bigelow Laboratory and colleagues will study new collections of chrysophytes from Atlantic, Pacific, and Indian ocean expeditions, with emphasis on electron microscopy of fine-scale internal features and on gene sequencing. DNA data will be accumulated from both nuclear and chloroplast genomes of individual strains. A modern and reliable systematic classification of the Chrysophyceae will benefit those working in areas of marine ecology, biodiversity, aquaculture, and marine biotechnology. ??