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Stability Parameter Estimates for Stem Volume for Loblolly Pine Families Growing in Different Regions in the Southeastern United States

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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.

Keywords: Genetic gain; Pinus taeda L; genotype x environment interaction; tree improvement

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

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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