Wei RP, Lindgren K, Lindgren D
Parental environment effects on cold acclimation and height growth in lodgepole pine seedlings
Silvae Genetica: 2001 50:252-257
Lodgepole pine stands from a number of seed sources were established in different commercial forest environments in northern Sweden in the 1970's as part of the introduction effort of this species. Parental environment effects (aftereffects) were studied in progeny from stands originating from two seed sources (Fireside and Toad River, British Columbia), with each seed source grown in six different Swedish environments. The occurrence of aftereffects on cold acclimation (freezing damage and mortality) and height growth of the progeny was investigated in the greenhouse and freezing chamber. One growing season height and cold acclimation differed significantly among stand sites, though the magnitude of the site effect was relatively small. Seedlings were taller at lower elevations, at higher site indexes and in longer growing degree-days environments. With longer growing degree-days freezing damage was significantly lower in the Fireside origin, but not significantly higher in the Toad River origin. Height and resistance to cold damage were positively correlated in the Fireside origin but not in the Toad River origin. The results suggest that aftereffects could be manipulated to benefit reforestation by choosing the proper combination of genetic materials and environments for seed production. Aftereffects could also constitute a problem for tree breeding, because the environment in which a seed sample is produced could be confounded with its inherent genetic value.
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