Temperature thresholds of shoot elongation in provenances of Pinus contorta

摘要: Periodicity of shoot elongation in seedlings Pinus contorta Dougl. ex Loud. was assessed during one growing season two extremely different environments (Cowichan Lake, and Red Rock, British Columbia) for 109 provenances sampled range wide. Analysis variance total growth parameters showed significant differences among geographic regions within each region. Our study also revealed tremendous genotype-by-environment interaction phenological traits. The response to temperature provenance from their curve using an original methodology. estimated threshold the responses (i.e., which reaches half its maximum) varied between 4.1 6.5°C regions. Threshold temperatures less variation than elongation, only northern thresholds significantly other results show that, ...