Ecological Factors in the Evolution of Plant Mating Systems

小行星9509006 自从托马斯·奈特在1799年提出“没有一种植物会为了世代的永恒而自我受精”以来，在理解植物交配系统的进化方面已经取得了很大的进展。". 然而，在这两个世纪里，大多数研究都与奈特的工作有一个共同的重要特征-强调近亲繁殖的健康后果。 对植物学家来说，近亲繁殖抑制是一个必须克服的障碍;对遗传学家来说，它是唯一能够阻止自交等位基因传播的力量。 因此，近交衰退的实验和理论分析多年来一直主导着植物交配系统的研究。 最近由Holsinger博士开发的质量作用模型表明，花粉传递的动态可能对植物交配系统的进化动态产生与近交衰退一样大的影响，并且作为分析花粉传递动态中个体差异的影响的综合框架，它显示出相当大的希望。 这也是唯一的方法，其中混合交配系统是进化稳定的参数值的范围很广，除非可能的自交率的范围受到限制。 这里提出的工作将扩展现有的大规模行动模型的方式，允许确定哪些方面的生殖过程中有最大的影响植物交配系统的进化动力学。

9509006 Holsinger Much progress has been made in understanding the evolution of plant mating systems since Thomas Knight proposed in 1799 that "No plant fertilizes itself for a perpetuity of generations.". In these two centuries, however, most studies have shared one significant feature with Knight's work--an emphasis on the fitness consequences of inbreeding. To botanists inbreeding depression is an obstacle that must be overcome; to geneticists it is the only force that can oppose the otherwise certain spread of a selfing allele. As a result, experimental and theoretical analyses of inbreeding depression have dominated the study of plant mating systems for many years. The mass-action model recently developed by Dr. Holsinger shows that the dynamics of pollen transfer may have an impact on the evolutionary dynamics of plant mating systems as great as that of inbreeding depression, and it shows considerable promise as a comprehensive framework for analyzing the impact of individual differences in pollen transfer dynamics. It is also the only approach in which mixed mating systems are evolutionarily stable for a broad range of parameter values, unless the range of possible selfing rates is constrained. The work proposed here will extend existing mass-action models in ways that allow determination of which aspects of the reproductive process have the greatest impact on the evolutionary dynamics of plant mating systems.