Dissertation Research: Phylogenetic analysis of the Neotropical plant genus Clusia (Clusiaceae)

论文研究：新热带植物Clusia属（Clusiaceae）的系统发育分析

• 批准号: 1702085
• 负责人: Lucinda McDade
• 金额: $ 1.73万
• 依托单位: Rancho Santa Ana Botanic Garden
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-05-01 至 2018-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702085&HistoricalAwards=false
• 关键词: Dissertation; Research; Phylogenetic; analysis; Neotropical

Clusia is a tropical group of about 300 species of shrubs and trees in the mangosteen family (Clusiaceae). Clusia plants have a number of notable characteristics that make them important for study. In addition to being one of the few trees and shrubs to grow on other plants (epiphytes), Clusia is the only known tree group to have Crassulacean Acid Metabolism (CAM) photosynthesis in which carbon (CO2) is absorbed during the night, when temperatures are lower and water loss is reduced. It is also one of only two groups of flowering plants in which flowers of some species produce floral resins instead of nectar as reward for pollinators. This project seeks to use genome-wide DNA sequence data to understand how species of Clusia are related to each other, and to estimate the evolutionary history of CAM photosynthesis and floral resins in the group. Results will enable the researchers to understand patterns of plant adaptation to water stress, and provide new insights into the evolution of pollination reward systems. Taken together, these results will permit a better understanding of how plants have evolved and how they have adapted to different environments. One graduate student and an undergraduate will be trained in molecular systematic and anatomical methods. Data from the project will also be used to enhance a summer research program at Rancho Santa Ana Botanical Garden that provides research experiences and training for students from Principally Undergraduate Institutions across the U.S. Results from the study will also be broadly disseminated in popular science magazines. This work focuses on reconstructing phylogenetic relationships in the Neotropical plant genus Clusia (Clusiaceae) using phylogenomic data. The resulting phylogeny will be used to: 1) test the monophyly of currently recognized sections and revise the classification for the genus, 2) investigate the distribution of CAM photosynthesis within the group and reconstruct the pattern of its evolution, and 3) reconstruct the evolution of resin-producing flowers within the genus. The resulting analyses will provide a better general understanding of plant physiology and plant-pollinator interactions.

山竹是山竹科（山竹科）约 300 种灌木和乔木的热带类群。 Clusia 植物具有许多显着的特征，这使得它们对研究很重要。除了是少数生长在其他植物（附生植物）上的树木和灌木之一之外，Clusia 也是唯一已知的具有景天酸代谢 (CAM) 光合作用的树群，在夜间温度较低且水分流失减少时吸收碳 (CO2)。它也是仅有的两组开花植物之一，其中某些物种的花产生花香树脂而不是花蜜作为对传粉者的奖励。该项目旨在利用全基因组 DNA 序列数据来了解 Clusia 物种之间的关系，并估计该群体中 CAM 光合作用和花树脂的进化历史。结果将使研究人员能够了解植物适应水分胁迫的模式，并为授粉奖励系统的演变提供新的见解。总而言之，这些结果将有助于更好地了解植物如何进化以及它们如何适应不同的环境。一名研究生和一名本科生将接受分子系统和解剖方法的培训。该项目的数据还将用于加强圣安娜牧场植物园的夏季研究项目，该项目为美国各地主要本科院校的学生提供研究经验和培训。该研究的结果也将在科普杂志上广泛传播。这项工作的重点是利用系统发育数据重建新热带植物属 Clusia (Clusiaceae) 的系统发育关系。由此产生的系统发育将用于：1）测试当前识别的部分的单系性并修改该属的分类，2）研究该类群内CAM光合作用的分布并重建其进化模式，以及3）重建该属内产树脂花的进化。由此产生的分析将提供对植物生理学和植物-传粉媒介相互作用的更好的一般理解。