Andersson Stefan, Waldmann Patrik
Department of Ecology, Lund University, SE-223 62 Lund, Sweden.
Hereditas. 2002;136(3):207-11. doi: 10.1034/j.1601-5223.2002.1360305.x.
Plants from a population of Scabiosa canescens, a locally rare species with a narrow ecological amplitude, were raised under uniform growth conditions to examine the phenotypic effects of one generation selfing and outcrossing. Particular attention was given to direct components of fitness (seedling biomass, rosette leaf number, head number, flower number per head), but two morphological characters (plant height, flower size) were also considered. Estimates of inbreeding depression (delta), adjusted for maternal effects and lack of balance, were compared and tested for significance using randomization and boostrap procedures. Inbreeding significantly depressed several characters during both early and late stages of the life cycle, with delta ranging from 0.14 (flower size) to 0.37 (seedling biomass). Based on these and other results, we propose that S. canescens is susceptible to inbreeding and that the genetic basis of inbreeding depression varies across life stages.
灰毛蓝盆花是一种当地稀有的物种，生态幅度狭窄，从该种群中选取的植株在统一的生长条件下培育，以研究一代自交和异交的表型效应。特别关注适合度的直接组成部分（幼苗生物量、莲座叶数量、头状花序数量、每个头状花序的花朵数量），但也考虑了两个形态特征（株高、花大小）。对经母体效应和不平衡调整后的近亲繁殖衰退估计值（δ）进行比较，并使用随机化和自助法程序检验其显著性。近亲繁殖在生命周期的早期和晚期均显著降低了几个特征，δ范围从0.14（花大小）到0.37（幼苗生物量）。基于这些及其他结果，我们提出灰毛蓝盆花易受近亲繁殖影响，且近亲繁殖衰退的遗传基础在不同生命阶段有所不同。
