Genetic analysis of ecological relevant morphological variability in Plantago lanceolata L. IV Response and correlated response to bidirectional selection for leaf angle1
Genetic analysis of ecological relevant morphological variability in Plantago lanceolata L. IV Response and correlated response to bidirectional selection for leaf angle1
复制标题
车前子生态相关形态变异的遗传分析。 IV 叶角双向选择的响应和相关响应1
作者：
K. Wolff;W. Delden
对轮叶车前（Plantagolanceolata）种群进行了四代叶角双向选择。第五代是通过行内和行间杂交。种群起源于一个高度和密集的植被非常潮湿的干草场。高水平的加性遗传变异由0.42的实现遗传力表示。从相关的响应实现的一致遗传力和遗传相关性进行了计算。叶角与其它性状之间存在着多种遗传正相关和负相关，开花期与叶角的负相关可能会阻碍这些相关性状的进一步进化，因为这与该生境所要求的条件相反，即早花植物具有较小的叶角。第五代杂交表现出明显的方向优势，即叶角较小的方向。
Bidirectional selection for leaf angle was imposed for four generations in a population of Plantago lanceolata. A fifth generation was made by intra- and interline crosses. The population originated from an extremely wet hayfield with a high and dense vegetation. A high level of additive genetic variability was indicated by a realized heritability of 0·42. From the correlated responses realized coheritabilities and genetic correlations were calculated. Several genetic correlations, positive and negative, between leaf angle and other characters were found. The negative correlation of flowering date and leaf angle may retard further evolution of these correlated characters as this is the opposite of what the conditions in this habitat require, namely early flowering plants with a small leaf angle. The fifth generation crosses revealed a substantial directional dominance in the direction of smaller leaf angle.