The early evolution of mate recognition in angiosperms: Austrobaileya scandens

被子植物配偶识别的早期进化：Austrobaileya scandens

• 批准号: 0640792
• 负责人: Joseph Williams
• 金额: --
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0640792&HistoricalAwards=false
• 关键词: early; evolution; mate; recognition; angiosperms

Novel forms of mate recognition are often found in animals and plants with internal fertilization. Angiosperms (flowering plants) are a premier example because their unique reproductive tract (formed by the closed carpel) is the site where pollen competition and novel incompatibility systems are expressed before fertilization. Little is known of the origin and early evolution of these features. This project initiates a series of studies on mate recognition in the earliest divergent lineages of flowering plants (the so-called basal angiosperms). Controlled pollinations and timed collections will be used to provide precise description of developmental interactions of pollen, carpel and ovule, as well as relative rates and timing of the fertilization process. Genetic studies of mating systems and inbreeding history will provide insight into the effects of these interactions. An important result will be a comparative analyses of developmental traits. This and future studies will address the following questions:. (1) What forms of pollen-carpel-ovule interactions are present in early extant lineages of angiosperms? (2) How are they involved in mate recognition? (3) What kinds of developmental transformation best explain among-taxon patterns of reproductive diversification in early angiosperms? This study will contribute to two rapidly advancing areas of interest - plant reproduction and early angiosperm evolution. The angiosperm stigma and transmitting tract have been seen as focal points of mate selection and rapid evolution, and the consequences of their origin and subsequent elaboration are of great interest to agronomists seeking to understand and manipulate breeding systems. Undergraduate and graduate students will be involved in studies that integrate mechanistic understanding of basic embryological processes with a broader perspective on evolutionary developmental diversity.

新的配偶识别形式经常在内部受精的动物和植物中发现。被子植物（开花植物）是一个首要的例子，因为它们独特的生殖道（由闭合的心皮形成）是花粉竞争和新的不亲和系统在受精前表达的场所。关于这些特征的起源和早期演化知之甚少。该项目启动了一系列关于开花植物（所谓的基底被子植物）最早分歧谱系中配偶识别的研究。控制授粉和定时采集将用于提供花粉，心皮和胚珠的发育相互作用，以及受精过程的相对速率和时间的精确描述。交配系统和近亲繁殖历史的遗传学研究将提供这些相互作用的影响的见解。一个重要的结果将是发展特征的比较分析。本研究和今后的研究将解决以下问题：(1)在被子植物现存的早期谱系中，花粉-心皮-胚珠的相互作用是什么形式的？(2)它们是如何参与配偶识别的？(3)什么样的发育转变最能解释早期被子植物生殖多样化的分类单元模式？这项研究将有助于两个快速发展的感兴趣领域--植物繁殖和早期被子植物进化。被子植物的柱头和传递道被视为配偶选择和快速进化的焦点，其起源和随后的加工的后果是寻求理解和操纵育种系统的农学家非常感兴趣。本科生和研究生将参与将基本胚胎学过程的机械理解与进化发育多样性的更广泛视角相结合的研究。