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Comparison of Genetic Variances Estimated from Seedlings and Rooted Cuttings

The levels of the additive and non-additive genetic variance in traits important for tree breeding programs have a great impact on the determination of the breeding strategies (Stonecypher and McCullough 1986). Also, it is very important for designing efficient deployment strategies. A few studies have reported considerable variation among clones within families for growth traits, fusiform rust resistance and root collar diameter in loblolly pine (Foster 1988, McRae et al. 1987, Paul et al. 1997). However, to our knowledge, comparison of genetic variances estimated from seedlings and clones of the same families has not been covered in the literature that could give further insight into the genetic basis of economically important traits. The objectives of this study were: (i) to partition genetic variance into additive, dominant and epistatic components and examine the time trends and differences among traits and (ii) to compare variance components and genetic variances from cuttings and seedlings of the same families.


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Author(s): Fikret Isik, Bailian Li, John L. Frampton

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2001

Section: Contribution Papers