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

Genetic Variation in Stem Forking in Loblolly Pine

In this study, we examined the genetic and environmental components of stem forking in loblolly pine using data from the diallel progeny tests of the second-cycle breeding program of the Cooperative (see Xiang et al. 2003 for details). Overall, data from 268 test series (each series is 4 tests of 30 crosses in a specific geographic region) were used to investigate the variation of forking over geographic regions. Of the 268 test series, 123 had forking rates between 20% and 80% and were used for the genetic analyses. Genetic gains based on breeding values of half-sib families were estimated. A selection intensity of 20% within region was used for all seven test regions.

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Author(s): Jin Sherry Xiong, Steve McKeand, Fikret Isik, Ross Whetten

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2009