Genetic gain from selection for rooting ability and early growth in vegetatively propagated clones of loblolly pine |
| |
Authors: | Brian S Baltunis Dudley A Huber Timothy L White Barry Goldfarb Henry E Stelzer |
| |
Institution: | (1) School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611, USA;(2) Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695, USA;(3) Department of Forestry, University of Missouri-Columbia, Columbia, MO 65211, USA;(4) Present address: Ensis-Genetics the joint forces of CSIRO and Scion, P.O. Box E4008, Kingston, 2604, ACT, Australia |
| |
Abstract: | A successful clonal forestry program for loblolly pine based on rooted cutting technology needs to consider selection for
both rooting ability and subsequent field growth. Rooting ability and second-year height were assessed in more than 2,000
clones from 70 full-sib families of loblolly pine. The bivariate analysis of rooting ability from five rooting trials and
field growth from six field trials allowed for estimation of the genetic covariance between rooting ability and second-year
height for parental effects, full-sib family effects, and the total genetic value of clones within full-sib family. There
was a positive genetic relationship between rooting ability and second-year height at all three genetic levels. The genetic
correlation at the parental level between rooting ability and second-year height was 0.32. At the full-sib family level, the genetic correlation between traits was 0.39. The correlation of total genetic values of clones for rooting ability and second-year height was 0.29. The genetic gain in rooting ability and second-year height was estimated for a number of deployment options based
on various selection scenarios using the best linear unbiased prediction (BLUP) values from the bivariate analysis. The deployment
strategies compared were (1) half-sib family deployment, (2) full-sib family deployment, and (3) clonal deployment. Moderate
to high family and clonal mean heritabilities, moderate to high type B genetic correlations, and substantial among-family
and among-clone genetic variation indicate the potential for increasing rooting efficiency and improving growth. |
| |
Keywords: | Genetic gain Clonal selection Genetic correlation |
本文献已被 SpringerLink 等数据库收录! |
|