Family x environment interaction for sweet in local and nonlocal seed sources of loblolly pine

Eight tests were planted in Mississippi, Arkansas and Oklahoma across diverse physiographical areas with each test containing five loblolly pine (Pinus taeda L) seed sources: coastal North Carolina, piedmont North Carolina, northern Mississippi/Alabama, central Mississippi/Alabama and Arkansas/Oklahoma. Each seed source consists of the best eight open-pollinated families for volume available from first generation seed orchards. The fastest growing seed source across sites at age eight was coastal North Carolina (28.24 dm3 /tree) and the slowest was Arkansas/Oklahoma (22.60 dm3 /tree). Piedmont North Carolina had less sweep (2.80 cm) than all other seed sources while the central Mississippi/Alabama seed source was the most crooked (3.13 cm). There was considerably more G x E for sweep among seed sources than families within seed sources. Conversely, for volume there was slightly less G x E at the seed source level than for families within seed sources for volume per tree. The more unstable seed sources for sweep were the coastal North Carolina source which dropped significantly in rank at two Mississippi sites and the central Mississippi/Alabama source which slightly dropped rank when planted northwest of its origin. There was no correlation among families for sweep and volume.

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Author(s): S. D. Douglass, Claire G. Williams, Clements C. Lambeth, Dudley A. Huber, L. C. Burris

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1993

Section: Concurrent Session 7: Breeding and Progeny Testing