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

Flowering Response of Juvenile Selections in Loblolly Pine

Four types of loblolly pine scions were grafted and subjected to female strobilus induction. These scion types were: age one (1) from nursery-grown seedlings, age three (3S) from a genetic field test averaging one meter in height, age three (3L) from a genetic field test averaging 2.4 meters in height and age eight (8). At 14 and at 26 months after grafting, there was a positive scion age effect on female strobilus production but none on male strobilus production. There was more pollen produced on scion type 3L compared to all other scion types. Grafting and applying flower induction treatments in the same year could reduce the breeding interval from five to four years for selections which are at least three years old. However, this method is not effective in reducing the breeding interval for early selection methods which rely on one-year-old selections. All juvenile selections readily responded to flower induction at 26 months from grafting. Additional Keywords: Early selection, Pinus taeda L., accelerated breeding technology.

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Author(s): L. C. Burris, Claire G. Williams, S. D. Douglass

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1991

Section: General Session: Seed Orchard Management