Systematics and Evolution of the Moss Family Mniaceae

苔藓科植物的系统学和进化

• 批准号: 9220676
• 负责人: Robert Wyatt
• 金额: $ 15万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9220676&HistoricalAwards=false
• 关键词: Systematics; Evolution; Moss; Family; Mniaceae

Studies of the systematics and evolution of polyploid mosses (those with duplicated sets of chromosomes) will be continued by researchers at the University of Georgia, making use of protein electrophoresis and other molecular techniques. Earlier work by the group has discovered at least four cases of allopolyploidy in the moss family Mniaceae (chromosome doubling following hybridization between genetically different populations). This important mode of speciation in other land plants had not been documented previously in any bryophyte. Work will focus on five complementary projects: 1. New studies of haploid-polyploid species pairs in the moss genera Cinclidium, Plagiomnium section Plagiomnium, Plagiomnium section Rostrata, and Mnium section Laevinervia; 2. Detailed studies of the taxonomic distribution of isozyme (gene) duplications to assess phylogenetic relationships within the family; 3. Comparisons of genetic variation in selected species that show intercontinentally disjunct distributions; 4. Analyses using DNA markers to clarify further the progenitors of certain allopolyploids; and 5. Cladistic analyses of species-level phylogenies based on morphological and isozyme data. The research will provide new insights into phylogenetic relationships in the moss family Mniaceae, and will also provide taxonomic updating for work toward the moss component of the Flora of North America enterprise.

佐治亚大学的研究人员将利用蛋白质电泳和其他分子技术继续对多倍体苔藓（具有重复染色体组的苔藓）的系统学和进化进行研究。该小组的早期工作在苔藓科 Mniaceae 中发现了至少四例异源多倍体（遗传不同种群之间杂交后的染色体加倍）。其他陆地植物中这种重要的物种形成模式以前从未在任何苔藓植物中被记录过。工作重点是五个互补项目： 1. 对苔藓属 Cinclidium、Plagiomniumsection Plagiomnium、Plagiomniumsection Rostrata 和 Mniumsection Laevinervia 的单倍体-多倍体物种对的新研究； 2. 详细研究同工酶（基因）重复的分类分布，以评估科内的系统发育关系； 3. 比较显示洲际间断分布的选定物种的遗传变异； 4. 使用DNA标记进行分析，进一步阐明某些异源多倍体的祖先； 5. 基于形态学和同工酶数据的物种水平系统发育的分支分析。该研究将为苔藓科 Mniaceae 的系统发育关系提供新的见解，还将为北美植物志事业的苔藓组成部分的工作提供分类学更新。