Variance components, heritabilities and gain estimates for growth chamber and field performance of Populus tremuloides: growth parameters.

摘要: Summary Variance components, heritabilities and gain estimates are reported for 29 clones (five populations) of Populus tremuloides from Alberta, Canada, which were grown (two years) at two field sites (northern southern Alberta) in controlled environment chambers (for 12 weeks). Results indicated more variation the clone-within-population level than population level. There was accounted by both growth chamber field. Caliper: clone-growth chamber: 32%, field: 22% to 7%; caliper: population-growth 12%, 2%; height: 7% 27%; budburst: 26%; root-to-shoot ratio: clonegrowth 17%. Broad-sense clone mean caliper also lower (0.56 0.29), (0.80). Heritabilities were: Bud-burst = 0.72, height 0.74, ratio 0.59. Expected gains, estimated based on data, 9% 38% across populations budburst, 11% 24% caliper, 12% final height, 8% 19% root-to-shoot. This study indicates that significant improvement traits is possible trembling aspen with a 17% selection intensity but care must be taken determining size region will comprise where selections made.