DISSERTATION RESEARCH: Systematic Biology of Costaceae(Zingiberales): Using Molecular and Morphological Data to Investigate Phylogenetics and Floral Evolution

论文研究：姜科（姜目）的系统生物学：利用分子和形态学数据研究系统发育和花卉进化

• 批准号: 0206501
• 负责人: Dennis Stevenson
• 金额: $ 0.85万
• 依托单位: New York Botanical Garden
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206501&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Systematic; Biology; Costaceae

A grant has been awarded to Drs. Dennis Wm. Stevenson, W. John Kress, and Chelsea D. Specht at the New York Botanical Garden to study the systematics and evolution of Costaceae, a tropical plant family of approximately 130 species closely related to the economically important bananas and gingers as well as prominent ornamentals such as Heliconia and Strelitzia (Bird-of-Paradise). Also known for their ornamental appeal, Costaceae have showy flowers and floral structures with shapes and colors that are closely linked to the attraction of pollinators. The proposed research is designed to determine evolutionary relationships among species within the family and investigate the historical context in which Costaceae has achieved its current level of diversity. Approximately 2500kb of DNA sequence data will be generated for 75 species chosen to represent floral and biogeographic diversity within the family. These data will be analyzed along with morphological character data using contemporary phylogenetic techniques. In addition, the development of the different floral shapes will be studied to determine potential mechanisms involved in the evolution of floral form.Certain species in the genus Costus are pollinated by hummingbirds, while others are bee-pollinated. The genus has thus been divided into two groups based on these overall floral characteristics, however recent evidence has shown that these groupings are not reflective of evolutionary history. Rather, it seems as though individuals can switch back and forth between hummingbird and bee pollination, possibly based on environmental conditions such as pollinator availability or efficacy. Since similar floral forms are found in South American and African species, it may be concluded that common types of pollination pressures occur in these geographically distant forest, yielding similar shapes and colors in distinct lineages of plants. This study will increase our understanding of the forces that promote speciation and diversity in tropical plants. In addition, floral development studies may help to indicate how genetic factors are involved in the evolution of diverse forms, leading to a clearer understanding of the genetic basis for biodiversity.

已向博士授予补助金。丹尼斯·WM. Stevenson、W. John Kress 和 Chelsea D. Specht 在纽约植物园研究鸡豆科植物的系统学和进化，豆科植物是一个热带植物家族，约有 130 个物种，与经济上重要的香蕉和生姜以及著名的观赏植物如香蕉和生姜密切相关。如赫蕉和鹤望兰（天堂鸟）。 牡丹科植物也因其观赏性而闻名，其花朵和花结构的形状和颜色与传粉媒介的吸引力密切相关。 拟议的研究旨在确定科内物种之间的进化关系，并调查牡蛎科达到目前多样性水平的历史背景。 将为代表该科内花卉和生物地理多样性的 75 个物种生成大约 2500kb 的 DNA 序列数据。 这些数据将与形态特征数据一起使用当代系统发育技术进行分析。 此外，还将研究不同花形状的发育，以确定涉及花形状进化的潜在机制。木香属中的某些物种由蜂鸟授粉，而其他物种则由蜜蜂授粉。 因此，根据这些总体花卉特征，该属被分为两组，但最近的证据表明，这些分组并不能反映进化历史。 相反，似乎个体可以在蜂鸟和蜜蜂授粉之间来回切换，这可能取决于授粉媒介的可用性或功效等环境条件。 由于在南美和非洲物种中发现了相似的花形，因此可以得出结论，常见类型的授粉压力发生在这些地理上遥远的森林中，在不同的植物谱系中产生相似的形状和颜色。 这项研究将加深我们对促进热带植物物种形成和多样性的力量的理解。 此外，花卉发育研究可能有助于表明遗传因素如何参与不同形式的进化，从而更清楚地了解生物多样性的遗传基础。