Diallel crosses in Picea abies, 2: Performance and inbreeding depression of selfed families
1996
Skroppa, T. (Norwegian Forest Research Inst., As (Norway))
Complete 10x10 diallels were performed within each of three natural Norway spruce populations. The performance of selfed and outcrossed families was compared for a large number of traits measured in a nursery test and in a short term field trial kept until the trees were 10 years old. The mean performance of the selfed families was significantly different from the mean of the outcrossed families for almost all traits studied. They germinated more slowly, had an earlier bud set, a shorter and differently timed shoot growth period with a lower rate of growth, and a reduced height and diameter growth. The mean inbreeding depression was significantly different from zero for most traits, in spite of the fact that only additive genetic variance was found in the statistical analyses of outcrossed families. A large variation in inbreeding depression was found among the selfed families. Different correlation patterns were observed in the three populations, both for the same trait measured on selfed and outcrossed families, and for inbreeding depression estimates of different traits. The results are discussed and interpreted based on the present knowledge of the causes of inbreeding depression and its variability
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