期刊
SEED SCIENCE RESEARCH
卷 25, 期 1, 页码 29-45出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0960258514000361
关键词
climate change; germination manipulation; germination niche; interior and coastal conifer species; phenotypic plasticity; seed developmental environment; timing of seed germination
资金
- Johnson's Family Forest Biotechnology Endowment
- British Columbia Forest Investment Account Forest Genetics Conservation and Management Program
- National Science and Engineering Research Council of Canada Discovery and Industrial Research Chair
Ecological (climatic and geographic) variation in early life-history transitions is a vital determinant of the adaptive evolution of timing of seed germination. This study aimed to investigate the correlation between timing of seed germination and environmental conditions during seed development. We examined seed germination timing of 15 coniferous seed lots of lodgepole pine, 'interior' spruce and western hemlock collected from natural stands in British Columbia (BC), Canada, under manipulated [stratification, thermopriming (15 or 20 degrees C) and their combinations] and non-manipulated (control) conditions. Timing of seed germination showed strong and positive correlation with the temperature-based environmental condition during seed development. This pattern persisted across species and seed lots within species, substantiating the historic importance of environmental conditions during seed development and maturation to life-history traits. Moreover, the strategy of phenotypic plasticity affecting timing of seed germination was observed across the applied germination treatments. These results provide insight into the germination niche as affected by global warming, indicating that conifers' seed dormancy in BC (north of 54 degrees N) tends to increase and the changes associated with early spring warm-up are expected to accelerate seedling emergence, as shortened winters would have a minimal effect on dormancy decay.
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