Dissertation Research: Heterochrony in the Dry Tropics: Moringa

论文研究：干燥热带地区的异时性：辣木

• 批准号: 9801128
• 负责人: Peter Raven
• 金额: $ 1.2万
• 依托单位: Washington University
• 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: 1998-09-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801128&HistoricalAwards=false
• 关键词: Dissertation; Research; Heterochrony; Dry; Tropics

9801128 Raven/Schaal/Olsen Moringa, the only genus of the horseradish tree family (Moringaceae), spans an unparalled range of form and geography, from massive, water-storing "bottle trees" in Madagascar and Namibia, to slender trees in Arabia and India, to tiny tuberous herbs in northeastern Africa. The highest diversity of plant form is thought to occur in the dry tropics, but the mechanisms that have produced this diversity is little studied. In this doctoral dissertation research, Peter Raven, Barbara Schaal and doctoral student Mark Olsen will examine the role of historical changes in the timing of developmental events ("heterochrony") in producing the array of shapes among species of Moringa. The research will employ a novel combination of techniques to follow the development of wood and flowers, both in wild plants and in those maintained under carefully controlled conditions of cultivation. The developmental studies will be interpreted in the context of an hypothesis of the historical ("phylogenetic") relationships of the different Moringa species that the researchers will infer from an analysis of morphological and molecular (gene sequence) characters. The research should contribute to an understanding of how plants with recent common histories may diversify in form and function to thrive in different environmental conditions. This award includes a contribution from the Africa, Near East and South Asia program, Division of International Programs.

9801128乌鸦/沙尔/奥尔森·莫林加是辣根树科(辣根树科)的唯一属，它的形态和地理范围无与伦比，从马达加斯加和纳米比亚的巨大的储水瓶形树，到阿拉伯和印度的细长树木，再到东北非的微小块茎草本植物。植物形态的最高多样性被认为出现在干燥的热带地区，但产生这种多样性的机制很少被研究。在这项博士论文研究中，Peter Raven、Barbara Schaal和博士生Mark Olsen将研究历史变化在发育事件的时间安排(“异时性”)中在产生Moringa物种之间的一系列形状中所起的作用。这项研究将采用一种新的技术组合来跟踪木材和花卉的发育，无论是在野生植物中还是在严格控制的栽培条件下维护的植物中。这些发育研究将在不同辣木物种的历史(“系统发育”)关系的假设的背景下解释，研究人员将通过对形态和分子(基因序列)特征的分析来推断该假说。这项研究应该有助于理解具有近期共同历史的植物如何在不同的环境条件下在形式和功能上多样化，从而茁壮成长。该奖项包括国际项目部非洲、近东和南亚项目的贡献。