Stability Parameter Estimates for Stem Volume for Loblolly Pine Families Growing in Different Regions in the Southeastern United States
Abstract:Stability analyses to evaluate genotype x environment (G x E) interaction for individual stem volume at 8 years of age were conducted in trials of open-pollinated loblolly pine (Pinus taeda L.) families established along an East-West (E-W) transect in coastal Mississippi, Alabama, Georgia, and Florida and along a North-South (N-S) transect from Virginia to Florida. The E-W analysis included 21 sites, and the N-S anlaysis included 20 sites. The stability analyses regressed the family-site means against site means. A family had average stabilty if the slope of the regression line (b) did not differ from the expected value of b = 1.0 and if the coefficient of determination (R²) of the regression was high. The family was unstable but responsive to site changes if the slope was b > 1.0. The family was very stable across sites (i.e., did not respond to site changes) when the slope was b < 1.0 across sites. The vast majority of the families tested had average stability for volume at age 8. In the E-W tests, 35/43 families had b ≍ 1.0 with high R² values. In the N-S tests, 32/43 had b ≍ 1.0 with high R² values. Although significant G x E interaction was found for the other families in the tests, the biological and economic importance of the interaction was minimal, since there was a relatively strong positive relationship between family stability value (b) and family mean volume performance (r = 0.75 in E-W tests, r = 0.62 in N-S tests). The convergence of the heterogeneous family slopes across sites to a common point indicated that very little family rank change occurred. The stability values in the E-W and the N-S tests were highly correlated (r = 0.94) to each other. With such high repeatability among the 34 common families, the inheritance of stability values appears strong. For. Sci. 36(1):10-17.
Document Type: Journal Article
Affiliations: Director and Associate Professor, Cooperative Tree Improvement Program, Department of Forestry, Box 8002, North Carolina State University, Raleigh, NC 27695-8002
Publication date: 1990-03-01
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