The Origins and Evolution of Parasitism in The Red Algae (Rhodophyta)

9355121戈夫许多高度专业化的寄生虫，如蚂蚁寄生虫、寄生其他真菌的真菌和红藻寄生虫可能是从它们的宿主进化而来的。加州大学圣克鲁斯分校的琳达·戈夫博士正在一组红藻(红藻门)中测试这一假说。由于寄生虫中经常发生的极端形态减少，寄生虫中经常缺少详细进化分析所需的关键形态特征。在这种情况下，来自DNA序列的分子数据为重建系统发育关系从而推断进化起源提供了丰富的、可比较的证据。人们正在研究巨型藻目和鹿目不同类群的红藻，以测试寄主-寄生虫对是否也是系统发育的姐妹群，预计核糖体DNA将提供重大证据。这项研究将直接检验生物学中所谓的埃默里法则，即寄生形式从寄主物种假想的进化。此外，新的分子数据与传统的形态特征相结合，将有助于改进几类海洋红藻的分类。

9355121 Goff Many highly specialized parasites such as ant parasites, fungi that parasitize other fungi, and red algal parasites may have evolved from their hosts. Dr. Lynda Goff of University of California at Santa Cruz is testing this hypothesis in a group of red algae (Rhodophyta). Because of the extreme morphological reduction that occurs frequently in parasites, key morphological features required for detailed evolutionary analyses are often missing in parasites. In such cases, molecular data from DNA sequences promise abundant, comparative evidence for reconstructing phylogenetic relationships and thus inferring evolutionary origins. Red algae in various groups of the orders Gigartinales and Ceramiales are being studied, to test whether host-parasite pairs are also phylogenetic sister-groups, with major evidence expected from nuclear ribosomal DNA. The research will provide a direct test of what has been called Emery's Rule in biology, the hypothesized evolution of parasitic forms from their host species. In addition, the new molecular data when integrated with traditional morphological characters will help improve the taxonomy of several groups of marine red algae.