Collaborative Research: The Evolution of Leaf Form in Viburnum (Adoxaceae)

合作研究：荚莲属植物（Adoxaceae）叶子形态的进化

• 批准号: 0842800
• 负责人: Michael Donoghue
• 金额: $ 21.1万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0842800&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; Leaf; Form

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)." Terrestrial plants display remarkable variation in many aspects of leaf form. Leaves serve as main sites for photosynthesis, and are thus primary custodians of plant growth and ultimately, fitness. Previous work suggests that there are optimal values for particular leaf traits in a given environment that will maximize growth, and thus predicts that certain leaf forms will evolve under certain conditions. However, evolutionary response to external pressures such as climate may be constrained, because leaves are developmentally and functionally integrated parts of the whole plant. In spite of the long-standing interest in the role of leaves in plant ecological adaptation, few studies have successfully documented consistent evolutionary shifts in leaf traits in relation to environment. This collaborative project will develop the plant lineage Viburnum (Adoxaceae), a widespread group of approximately 168 species of woody shrubs and trees, as a model system for investigations into the ecology and evolution of leaf form. Viburnum is ideally suited for this problem as it exhibits a remarkable diversity of leaf shapes and sizes, and much is already known regarding evolutionary relationships within the group. The interdisciplinary PI team will collect physiological data from two common gardens, anatomical and environmental data from herbarium collections, and molecular sequence data for phylogenetic analyses to produce a unique, whole-lineage perspective on leaf evolution that is simultaneously detailed and broad. They will directly test several hypotheses regarding stem and leaf co-evolution, the decoupling of certain aspects of leaf water use from photosynthetic capacity, and the evolution of particular leaf traits in response to environmental conditions. One prediction is that considerable leaf shape diversity has evolved within a relatively narrow climate space, suggesting that other factors have historically been more important in shaping the evolutionary trajectory of leaf structure and function. Results from this work may be directly relevant to predicting plant response to rapid climate change. This work will also result in the development of new online community-wide teaching and research resources, such as a large leaf collection for anatomical study. In conjunction with the Peabody Museum of Natural History and public school teachers from the Providence, RI area, the PI's will also develop two 'leaf diversity' education modules targeted for elementary and high school levels in the New Haven and Providence school districts.

“该裁决是根据2009年《美国复苏与再投资法》（公法111-5）资助的。”陆生植物在叶片形式的许多方面表现出显着的变化。叶子是光合作用的主要地点，因此是植物生长的主要托管人，最终是健身。先前的工作表明，在给定环境中，特定叶片性状的最佳值将最大化生长，因此预测某些叶片形式将在某些条件下进化。但是，可能会限制对气候诸如气候之类的外部压力的进化反应，因为叶子在整个植物的发育和功能上是整合的部分。尽管人们对叶子在植物生态适应中的作用长期存在兴趣，但很少有研究能够成功地证明叶片性状与环境相关的叶片特征的一致进化转移。这个协作项目将开发植物谱系（Adoxaceae），这是一组大约168种木本灌木和树木，作为一种模型系统，以研究叶片形式的生态学和进化。 Viburnum非常适合此问题，因为它表现出了显着的叶形形状和大小，并且在该组内的进化关系中已经知道了很多。跨学科的PI团队将从两个常见的花园，解剖学和环境数据中收集生理数据，以及用于系统发育分析的分子序列数据，以产生对叶片进化的独特，全条观的观点，同时详细且广泛。他们将直接检验有关茎和叶子共同进化的几个假设，叶水使用的某些方面与光合作用能力的某些方面以及对环境条件响应的特定叶片性状的演变。一个预测是，在相对狭窄的气候空间中，相当大的叶片形状多样性已经发展，这表明其他因素在塑造叶片结构和功能的进化轨迹中更为重要。这项工作的结果可能与预测植物对快速气候变化的反应直接相关。这项工作还将导致开发新的在线社区范围内的教学和研究资源，例如用于解剖学研究的大型叶子收集。与Peabody自然历史博物馆和来自RI地区的Peabody博物馆和公立学校教师一起，PI还将开发两个针对纽黑文和普罗维登斯学区的小学和高中级别的“叶子多样性”教育模块。