School of Forest Resources and Conservation, University of Florida, 32611, Gainesville, Florida, USA.
Theor Appl Genet. 1996 Jan;92(1):53-63. doi: 10.1007/BF00222951.
Genetic-parameter estimates and parental breeding-value predictions were compared from open-pollinated and control-pollinated progeny populations of Eucalyptus globulus and two populations of E. nitens. For E. globulus there were two types of open-pollinated populations (native stand open-pollinated and seed orchard open-pollinated) and two types of control-pollinated populations (intra-provenance and interprovenance full-sib families). For E. nitens there were two populations, a seed orchard open-pollinated population and intra-provenance full-sib families. Progeny tests were established across multiple sites and 2-year height and diameter were measured and volume calculated. Genetic parameters from native stand open-pollinated E. globulus were unlike the parameters from the other three E. globulus populations; heritability estimates were severely inflated, presumably due to high levels, and possibly differential levels, of inbreeding depression relative to the other populations. Estimates of dominance variance in the E. globulus full-sib populations were high, but were zero in the E. nitens population. Correlations among parental breeding values, predicted using data from the different populations, were generally low and non-significant, with two exceptions: predictions from the two E. globulus full-sib populations were significantly correlated (r=0.54, P = 0.001), as were predictions from the E. nitens seed orchard OP and full-sib population (r = 0.61, P = 0.08). There was some indication that superior parents of E. globulus native stand open-pollinated families also tended to have above-average breeding values based on the performance of intra-provenance full-sib offspring. The consequences of these results for exploitation of base-population collections from native stands are discussed.
对来自桉树属巨桉和两种桉树属细叶桉的自由授粉和控制授粉后代群体的遗传参数估计值和亲本育种值预测进行了比较。对于巨桉，有两种类型的自由授粉群体（原生林自由授粉和种子园自由授粉）和两种类型的控制授粉群体（种内和种间全同胞家系）。对于细叶桉，有两个群体，一个是种子园自由授粉群体，一个是种内全同胞家系。在多个地点建立了后代测试，并测量了 2 年生的高度和直径，计算了体积。原生林自由授粉巨桉的遗传参数与其他三种巨桉群体的参数不同；遗传力估计值严重膨胀，可能是由于与其他群体相比，存在高水平且可能存在差异水平的近交衰退。巨桉全同胞群体的显性方差估计值较高，但细叶桉群体的显性方差估计值为零。使用不同群体的数据预测的亲本育种值之间的相关性通常较低且不显著，但有两个例外：两个巨桉全同胞群体的预测值显著相关（r=0.54，P=0.001），细叶桉种子园 OP 和全同胞群体的预测值也显著相关（r=0.61，P=0.08）。有一些迹象表明，原生林自由授粉巨桉家系的优良亲本，根据种内全同胞后代的表现，其育种值也往往高于平均水平。讨论了这些结果对利用原生林基础群体收集材料的影响。
