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Interprovenance Breeding in Scots Pine

In a breeding program begun in 1970, 7 select tester trees are being used to produce progenies for evaluating 43 Scots pine seed orchard selections of provenance origin and to provide material for recurrent selection. Average cone survival has been 50 percent (range 36 to 60) and number of sound seeds per cone 6 (range 3 to 12) over a 5-year period. Preliminary analyses indicate 76 and 58 percent of the total variation for cone survival and number of seed per cone, respectively, is attributable to the ovulate parents. General combining ability (GCA) effects appear larger than specific combining ability (SCA) effects among testers. GCA effects were not different except for one tester in cone survival. SCA effects indicate wide variability. Data suggest sufficient variation in cone survival and seed per cone for effective selection; and importance of choosing specific combinations of parents. Additional keywords : Scots pine, Pinus sylvestris , breeding program, tester-cross, cone and seed production.

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Author(s): David F. Van Haverbeke

Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1976