Predictions of Genetic Gain from Various Selection Methods in Open Pollinated Pinus banksiana Progeny Trials

1990

2 Abb., 10 Tab., zahlr. Lit. Ang.

Unselbständiges Werk

4683

200051187

Variance components and heritabilities of tree height and stem diameter on three sites at age 6 and 14 are presented for 100 open pollinated Pinus banksiana (Lamb.) progenies. The progenies were sampled from two stands within each of five distinct areas (populations) in the Ottawa Valley, Ontario. Combining informatin from several sources into an index promised to double the expected genetic gain from selections based on single trait values. Family selection followed by within-family selection was less effective than index selection but superior to simple mass selection. Mass selection did not lead to a rapid loss of variation or inbreeding. The lack of significant G X E interactions and the absence of important stand and area effects in the Ottawa Valley will facilitate the breedings programs in this commercially important species. Results at age 14 generally confirmed results obtained at age six.