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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 21st Southern Forest Tree Improvement Conference (1991) → Impact of Nursery Management Practices on Heritability Estimates and Frequency Distributions of First-Order Lateral Roots of Loblolly Pine

Impact of Nursery Management Practices on Heritability Estimates and Frequency Distributions of First-Order Lateral Roots of Loblolly Pine

Frequency distribution and heritability of first-order lateral root (FOLR) numbers in 1-0 seedlings were followed for 5 years for 115 different half-sib seedlots from the Georgia Forestry Commission's Arrowhead and Baldwin Seed Orchards. In 1986 and 1987, seedlings were permitted unrestricted growth under management conditions similar to those practiced in most forest tree nurseries in the Southern United States. Seedlings were placed in four different classes based on the number of FOLR with proximal diameters above a threshold value. These classes were 0-3, 4-5, 6-7, and >8 FOLR. In 1988, 1989, and 1990, management practices were altered to restrict height growth by 30 to 40 percent for each of four FOLR groupings.


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Author(s): Paul P. Kormanik, H. David Muse, Shi-Jean Susana Sung

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

Section: General Session: Genetic Testing and Selection