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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 18th Southern Forest Tree Improvement Conference (1985) → Genetic Parameters For Two Eastern Cottonwoodpopulations In The Lower Mississippi Valley

Genetic Parameters For Two Eastern Cottonwoodpopulations In The Lower Mississippi Valley

Genetic variances and heritabilities were compared between samples of two populations of eastern cottonwood tested on adjacent sites. Data for fourth-year growth and second-year survival yielded little difference between families in either population with most of the genetic variation associated with clones-within-families. Resultant estimates of additive genetic variance were low with much higher estimates of dominance variance. Consequently, narrow-sense heritabilities ranged from 0.00 to 0.27, and broad-sense heritabilities ranged from 0.01 to 0.45. A more efficient future test design includes smaller blocks and noncontiguous family and clonal plots.


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Author(s): G. Sam Foster

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1985