A Mass-Action Approach to the Study of Plant Mating Systems

研究植物交配系统的群体作用方法

• 批准号: 9107330
• 负责人: Kent Holsinger
• 金额: $ 2.5万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9107330&HistoricalAwards=false
• 关键词: Mass; Action; Approach; Study; Plant

Although great progress in understanding the variation in plant mating systems has been made in the past century, most studies have focused on the role of the negative effects of inbreeding. Recently, a different approach has been developed, one that is based on a general analysis of plant reproduction and pollination biology. It assumes that rates of self-fertilization are determined, at least in part, by the relative amount of self and outcross pollen on stigmas--an assumption called the mass-action assumption. Preliminary work suggests that models incorporating the mass-action assumption may be able to explain the full range of observed plant mating systems, even without considering the effects of inbreeding. This preliminary work will be extended in two ways. First, the mathematical models will be extended to include (1) a more realistic representation of the spatial structure of plant populations and (2) inbreeding depression. Second, experimental tests of the model predictions will be made by taking advantage of a well studied mating system polymorphism in Senecio vulgaris (1) to make direct estimates of the key features of the model in natural and experimental populations and (2) to investigate the role of frequency-dependent pollen export in maintenance of the variations in mating system.

尽管在过去的一个世纪中，在理解植物交配系统的变化方面取得了巨大进展，但大多数研究都集中在近交性负面影响的作用上。 最近，已经开发了另一种方法，一种方法基于对植物繁殖和授粉生物学的一般分析。 它假设自我施肥的速率至少部分通过在污名上的自我和脱落花粉的相对数量来确定，这是一个称为质量行动假设的假设。 初步工作表明，即使不考虑近亲繁殖的影响，结合质量成分假设的模型也可能能够解释观察到的植物交配系统的全部范围。 这项初步工作将以两种方式扩展。 首先，数学模型将扩展到包括（1）植物种群的空间结构和（2）近交抑郁症的更现实的表示。 其次，通过利用塞内西奥·普拉加里斯（Senecio vulgaris）中研究良好的交配系统多态性（1）的实验测试，以直接估算自然和实验人群中该模型的关键特征，并且（2）研究频率依赖性的粉pollen粉在维持频率上的作用。