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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Genetic Variation Of Six-year-old Open-pollinated Progeny Of Sweet Pecan Trees

Open-pollinated progenies from the 10 best phenotypes within each of 4 localized stands of pecan were grown in plantations at two different locations. Five years after outplanting, the trees on a well-drained upland site were significantly taller and had 30% greater survival than the progenies on a moderately-drained bottomland site. Family-within-stand variation was found to be significant for height and survival but there was no variation among stands nor were there genotype-by-environment interactions ( p < . 05). Individual tree heritability for height was .17 and family heritability was 0.48. By selecting the best four families realized gain was 29% for height and 5% for survival. Phenotypic selection of the best trees was found to be of no value when the selected progeny were compared to progeny of unselected trees within the stands. Additional keywords: Carya illinoensis, genetic gains, half-sib families, heritability, phenotypic selection.


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Author(s): John R. Tolliver, Furcy J. Zeringue, II

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1983