Collaborative Research: The Evolutionary Consequences of Floral Display Size in a Self-compatible plant

合作研究：自交亲和植物中花卉展示尺寸的进化后果

• 批准号: 9816712
• 负责人: Jeffrey Karron
• 金额: $ 26.01万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9816712&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolutionary; Consequences; Floral

Karron 9816712The number of flowers blooming simultaneously on a self-fertile plant may have profound consequences for reproductive success. For example, plants with large displays may receive more pollinator visits, increasing seed production. However, large displays may also entail significant costs. Self-pollination is more likely, since large displays promote within-plant pollinator movements. If there is inbreeding depression, female reproductive success will suffer. Self-pollination may also decrease pollen transfer to other plants, reducing male reproductive success. This project utilizes a novel experimental system to test the hypothesis that these conflicting selection pressures favor the evolution of intermediate-sized floral displays. Monkeyflower (Mimulus ringens) displays will be manipulated in replicate (cloned) populations consisting of genetically distinct individuals. These arrays facilitate unambiguous measures of paternity and individual selfing rates. Manipulation of floral display size on a common genetic background allows examination of how floral display and other traits interact in affecting reproductive success. To examine how floral display may evolve in natural populations, an artificial selection experiment will be conducted under field conditions in a common garden. These experiments will provide unique data concerning the adaptive significance of floral displays, and will enhance our understanding of the evolution of plant mating systems. The results of this research will also have important implications for agriculture (breeding of crops to maximize yield) and conservation biology (maximizing reproductive success of endangered species in botanic gardens).

Karron 9816712同时在自肥植物上盛开的花朵数量可能会对生殖成功产生深远的影响。 例如，具有较大展示的植物可能会接受更多的传粉媒介就诊，从而增加种子的产量。 但是，大型显示器也可能需要大量成本。 自花授粉更有可能，因为大型显示器会促进植物内传粉媒介运动。 如果存在近亲抑郁症，女性生殖成功将会受到影响。 自花授粉还可以减少向其他植物的花粉转移，从而降低男性生殖成功。 该项目利用一种新型的实验系统来检验这些相互矛盾的选择压力有利于中型花卉展示的演变的假设。 猴子（Mimulus ringens）显示器将以复制（克隆）种群来操纵，由遗传上不同的个体组成。 这些阵列促进了陪产父和个体自我自我率的明确度量。 在常见的遗传背景上操纵花卉显示大小，可以检查花卉表现和其他特征如何影响生殖成功。 为了检查自然种群的花卉表现如何发展，将在普通花园的田间条件下进行人工选择实验。 这些实验将提供有关花卉展示的适应性意义的独特数据，并将增强我们对植物交配系统进化的理解。 这项研究的结果还将对农业（农作物的繁殖以最大化产量）和保护生物学（植物园中濒危物种的生殖成功）具有重要意义。