Genetic analysis of growth curves for a woody perennial species, Pinus taeda L.

被引:25
|
作者
Gwaze, DP [1 ]
Bridgwater, FE
Williams, CG
机构
[1] Texas Forest Serv, Forest Sci Lab, College Stn, TX 77843 USA
[2] Texas A&M Univ, USDA, Forest Serv, Forest Sci Lab, College Stn, TX 77843 USA
[3] Texas A&M Univ, Grad Program Genet, College Stn, TX 77843 USA
关键词
Richards' function; heritability; age-age correlations; height; conifers;
D O I
10.1007/s00122-002-0892-6
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Inheritance of growth curves is critical for understanding evolutionary change and formulating efficient breeding plans, yet has received limited attention. Growth curves, like other characters that change in concert with development, often have higher heritability than age-specific traits. This study compared genetic parameters of height-growth curves with those of age-specific heights for a conifer, Pinus taeda L. Growth curves were fitted with: (1) a linear regression model, and (2) a non-linear model based on Richards' function using two sources of height data: two six-parent diallel tests assessed at age 2 to 10 years and two tests from a nested mating design with 222 parents assessed at I to 25 years. Additive genetic control of growth-curve parameters was moderate (h(2) = 0.06 to 0.26) and slightly lower than that for age-specific heights. Additive variance exceeded dominance variance for rate and shape parameters, but not for the asymptote. Genetic correlations among growth-curve parameters were high. Early selection on height was as efficient as selection on growth-curve parameters.
引用
收藏
页码:526 / 531
页数:6
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