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Inbreeding Depression in Eastern White Pine

Inbreeding depression was measured in 3 progeny tests of eastern white pine derived from crosses in a native stand. Nine Si progenies were compared with outcross progenies from the same trees. Values for progenies of individual trees, based on all check crosses, varied from -.12 to -.44, and for locations from -.15 to -.38. More precise comparisons, based on check crosses of several females with the same males, indicated that (1) an estimate based on an open-pollinated check progeny sometimes differed widely from an estimate based on a group of outcross means; (2) individual trees usually did not vary widely in inbreeding depression within experiments; (3) there was a large effect of planting site on inbreeding depression. Additional keywords : Inbreeding, selfing, white pine, Pinus strobus .


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Author(s): Howard B. Kriebel

Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1974