Molecular and Morphological Studies of Evolution in the Gelidiales (Rhodophyta)

石花菜目（红藻门）进化的分子和形态学研究

• 批准号: 9726170
• 负责人: D. Wilson Freshwater
• 金额: $ 8.49万
• 依托单位: University of North Carolina at Wilmington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726170&HistoricalAwards=false
• 关键词: Molecular; Morphological; Studies; Evolution; Gelidiales

9726170 Freshwater The red algal order Gelidiales contains many economically important species; gelidialean algae are a principal source of agar, widely used in the food and cosmetics industry and in microbiological, biochemical and genetics research. However, the group as a whole, and species within it, have been difficult to identify and classify. Traditional classifications of red algae, including the Gelidiales, have been based on particular life history types, and characteristics of the developmental morphology of the female reproductive system. Developmental characteristics of the female reproductive system and related stages in the life history are thought to be useful in classifications of red algae, because changes in these characters would prevent cross-breeding between changed and unchanged algal populations (reproductive isolation), leading to the formation of species and, ultimately, lineages of species (clades). Independent data are needed to test the idea that these reproductive characters are useful in classification, and also are needed to provide a means of classifying algae for which, as in many Gelidiales, information from reproductive systems is hard to obtain or interpret. In this study, D. Wilson Freshwater will document the vegetative morphology and reproductive strategies of key gelidialean taxa, and will reconstruct the phylogenetic history of these taxa on the basis of both these characters and DNA sequence data from several nuclear and plastid genes. The work is expected to result in a robust reconstruction of the phylogenetic history of the Gelidiales and evaluate the utility of life history and reproductive characters in reconstructing this history, in Gelidiales and in other red algae.

9726170淡水 红藻目Gelidiales包含许多经济上重要的物种; Gelidialean藻类是琼脂的主要来源，广泛用于食品和化妆品工业以及微生物，生物化学和遗传学研究。 然而，这个群体作为一个整体，以及其中的物种，很难识别和分类。红藻的传统分类，包括Gelidiales，一直基于特定的生活史类型和雌性生殖系统的发育形态特征。 雌性生殖系统的发育特征和生活史中的相关阶段被认为在红藻的分类中是有用的，因为这些特征的变化会阻止改变和不变的藻类种群之间的杂交（生殖隔离），导致物种的形成，并最终形成物种的谱系（分支）。需要独立的数据来测试这些生殖特征在分类中有用的想法，并且还需要提供一种对藻类进行分类的方法，因为在许多Gelidiales中，生殖系统的信息很难获得或解释。 在本研究中，D. Wilson Freshwater将记录关键的gelidialean类群的营养形态和生殖策略，并将根据这些特征和来自几个核和质体基因的DNA序列数据重建这些类群的系统发育历史。 这项工作预计将导致一个强大的重建的系统发育史的Gelidiales和评估的效用的生活史和生殖特征重建这一历史，在Gelidiales和其他红藻。