Genealogical Studies of Polyploidy Using Tetraploid Zea Perennis (Poacease) as a Model System

9815855 GautPolyploidy是一种使生物体的染色体内容物倍增的机制，这是一种在植物中特别重要的过程。大约70%的植物具有多倍体起源，小麦和棉花等主要作物的农业生产力归功于最近的多倍体事件。然而，人们对多倍体基因的进化命运知之甚少，这是我们对植物遗传学理解的一个巨大差距。这项研究的重点是遗传变异的玉米，多倍体是一个密切相关的玉米（玉米）。研究的目的是：i）测量多倍体基因的遗传变异，ii）分析遗传变异的模式，以确定作用于重复基因的群体力，iii）确定多倍体过程是发生一次还是多次。遗传变异将通过对来自30个代表多年生玉米及其假定祖先Z的个体的3个基因的DNA测序来测量。双孔虫该项目的数据将与之前对玉米和其他野生近缘种的研究数据进行分析。作为同类研究中的第一项研究，拟议的工作有可能为广泛的问题提供独特和普遍的见解，例如多倍体形成的方式，多倍体基因的遗传模式，以及重组等进化过程的相对重要性，突变和自然选择在形成多倍体的遗传多样性。 H：\popbio\abstracts\fy1999\9815855（Gaut摘要）

9815855GautPolyploidy is a mechanism that multiplies the chromosomal content of an organism, a process that is particularly important in plants. Approximately 70% of all plants have a polyploid origin, and major crops like wheat and cotton owe their agricultural productivity to recent polyploid events. Little is known, however, about the evolutionary fate of polyploid genes, and this is a broad gap in our understanding of plant genetics. This study focuses on genetic variation in Zea perennis, a polyploid that is a close relative of maize (corn). The goals of the study are to: i) measure genetic variation in polyploid genes, ii) analyze the pattern of genetic variation to determine the population forces acting on duplicated genes, and iii) determine whether the polyploid process occurred once or multiple times. Genetic variation will be measured by sequencing DNA of 3 genes from 30 individuals representing Zea perennis and its presumed ancestor, Z. diploperennis. The data from this project will be analyzed with data from previous studies of maize and other wild relatives.As the first study of its kind, the proposed work has the potential to provide unique and general insights into a broad array of issues, such as the way polyploids form, the mode of inheritance of polyploid genes, and the relative importance of evolutionary processes like recombination, mutation and natural selection in shaping genetic diversity in a polyploid. H:\popbio\abstracts\fy1999\9815855 (Gaut abstract)