Heritability, Age-Age Correlations, and Inferences Regarding Juvenile Selection in Jack Pine

Washington D.C.

1988

S. 1076-1082

3 Abb., 1 Tab., 20 Lit. Ang.

Bandaufführung

7380

16089

Heights of jack pine trees from 101 open-pollinated families were measured at ages 1, 2, 3, 5, and 7 years. Age-age genetic and phenotypic correlations, and age-related fluctuations in heritability were evaluated todetermine the optimal age for juvenile selection. Simple linear regressions of genetic and phenotypic age-age correlations on the natural log of the ratio of the two ages were significant (r2 = 0.84 and 0.93 respectively). Genetic age-a ge correlations were greater than corresponding phenotypic correlations, particularly at longer age intervals. Heritability for tree height was highest at age1 year, lowest at age 2, and intermediate thereafter. Results suggests that se lection as early as age one would be an efficient strategy for improving rotatin-age growth