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Genetic Control of Sex Ratio, Earliness and Frequency of Flowering in Populus Tremuloides

The major objective of the forest genetics program which I initiated in 1959 was to elucidate the role of the genotype and the mode of genetic control of traits in a forest tree species that are of importance to society. Trembling aspen (Populus tremuloides Michx.) was selected as the experimental tree, and trees in 26 natural stands scattered throughout the Adirondack Mountains and adjoining regions of New York State were selected using random procedures to serve as parents in controlled crosses. Since most economically important traits are quantitative in nature, experimental designs have been chosen that permit the estimation of the heritability of traits on the basis of the covariance between half-sibling families. The results of seven years of observations on flowering in three of the oldest experimental plantings will be reported in this paper.

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Author(s): Frederick A. Valentine

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1974