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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 20th Southern Forest Tree Improvement Conference (1989) → Genetic Performance and Early-Age Selection Within a Ten-Year Old Mid-West Sycamore Progeny Test

Genetic Performance and Early-Age Selection Within a Ten-Year Old Mid-West Sycamore Progeny Test

Geographic seed source adaptability, family performance and early-age selection were investigated in a ten-year-old open-pollinated American sycamore test located in southern Illinois. Low genetic (rg = 0.06) and phenotypic correlations (r = 0.44) between age-1 height and age-10 volume indicate the uselessness of age-1 height as a correlated selection trait. Large genetic (r = g 0.96) and phenotypic correlations (r = 0.73) between age-6 height and age-10 volume suggest the use of age-6 height as early-age selection trait. Estimates of indirect gain for age-10 volume obtained through coefficients of genetic prediction (CGP) and correlated response (CR) were highest from selection of age-7 height (e.g. CGP = .131, CR = 18.0%). In terms of genetic gain per unit of time age-6 height provided the optimal selection differential for age-10 volume. Keywords: Platanus occidentalis L., early-age selection, coefficient of genetic prediction, correlated response.


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Author(s): Randall J. Rousseau

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1989

Section: Concurrent Session 2B