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.

已向博士授予了赠款。丹尼斯Wm。 Stevenson，W。JohnKress和Chelsea D. Specht在纽约植物园，研究Costaceae的系统和进化，Costaceae是一个与经济上重要的香蕉和牙龈和著名的装饰品以及Heliconia和Strelitzia（例如Heliconia and strelitzia（bird of-bird of-paradise）密切相关的热带植物家族）。 Costaceae也以其装饰性的吸引力而闻名，具有艳丽的花朵和花卉结构，形状和颜色与传粉媒介的吸引力紧密相关。 拟议的研究旨在确定家族中物种之间的进化关系，并研究Costaceae实现其当前多样性水平的历史背景。 对于代表家庭内的花卉和生物地理多样性，将生成大约2500kb的DNA序列数据。 这些数据将与当代系统发育技术一起分析与形态特征数据。 此外，还将研究不同花卉形状的发展，以确定花卉形式进化所涉及的潜在机制。一般的costus中的物种被蜂鸟授粉，而其他物种则是蜂授粉的。 因此，根据这些总体花卉特征，该属已分为两组，但是最近的证据表明，这些分组并不反映进化史。 相反，似乎个人可以基于环境条件，例如授粉媒介的可用性或功效，在蜂鸟和蜜蜂授粉之间来回切换。 由于在南美洲和非洲物种中发现了类似的花卉形式，因此可以得出结论，在这些地理遥远的森林中发生了共同的授粉压力类型，在不同的植物谱系中产生了相似的形状和颜色。 这项研究将增加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，花卉发展研究可能有助于指出遗传因素如何参与不同形式的演变，从而更清楚地了解生物多样性的遗传基础。