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; 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.

新型的伴侣识别形式通常在具有内部受精的动物和植物中发现。被子植物（开花植物）是一个主要的例子，因为它们独特的生殖道（由封闭的皮层形成）是在受精前表达花粉竞争和新型不兼容系统的地点。这些特征的起源和早期演变知之甚少。该项目启动了一系列关于开花植物（所谓的基底被子植物）最早分歧谱系中伴侣识别的研究。受控的授粉和定时收集将用于提供花粉，皮肤和胚珠的发育相互作用的精确描述，以及受精过程的相对率和时间。交配系统和近亲历史的遗传研究将洞悉这些相互作用的影响。一个重要的结果将是对发展特征的比较分析。这项和未来的研究将解决以下问题： （1）在被子植物的早期谱系中存在哪些形式的花粉 - 肉板 - 卵巢相互作用？ （2）他们如何参与伴侣的认可？ （3）哪些类型的发育转型可以最好地解释早期被子植物中生殖多样化模式中的taxon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的进化。被子植物的污名和传播道被视为伴侣选择和快速进化的焦点，其起源和随后的阐述的后果对寻求理解和操纵繁殖系统的农艺师引起了极大的兴趣。本科生和研究生将参与研究，将基本胚胎学过程的机理理解与进化发展多样性的更广泛的看法相结合。