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

世界上的淡水和海洋藻类是一组重要的光合生物，通常与植物和真菌一起进行植物学研究。在海洋中，它们是海洋动物的主要食物。金藻科是一种以金色为特征的藻类（由于光合色素和储存化合物）；尽管它们的外部形态简单，但在生理和超微结构上却是多种多样的。在过去的三十年里，积极的海洋学探索以及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chrysophytes被错误地分类或只是被遗漏了。此外，由于需要一种简单的鉴定方案，最初的chrysophytes分类将重点放在鞭毛和其他用光学显微镜观察到的外部细胞壁特征上，这些特征现在被怀疑代表了适应开阔海洋条件的趋同进化的实例。毕格罗实验室的罗伯特·安德森博士和他的同事们将研究从大西洋、太平洋和印度洋探险中收集到的新绿藻，重点是用电子显微镜观察精细的内部特征和基因测序。DNA数据将从单个菌株的核基因组和叶绿体基因组中积累。一个现代的、可靠的、系统的蝶科分类将有利于海洋生态学、生物多样性、水产养殖和海洋生物技术等领域的工作。？?

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. ??