Population Differentiation in Seedling Root Size Between Adjacent Stands of Jack Pine
Seeds from adjacent wet-site and dry-site jack pine stands were planted in a common growth chamber, and seedlings were grown with and without drought. Population differentiation in root and shoot growth traits was assessed 14 and 35 days after seedling emergence. Seedlings originating from the wet site had significantly more tertiary roots than those originating from the dry site. Differences between wet- and dry-site populations in secondary root length and shoot biomass disappeared when adjusted for the effects of higher mean seed weight in the dry-site population. The strength of correlations between seedling size parameters and seed weight varied with seedling age and exposure to drought. Droughty conditions inhibited secondary and tertiary but not primary root growth. For. Sci: 38(4):777-785.
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Document Type: Journal Article
Affiliations: Professor, Department of Forest Science, University of Alberta, Edmonton, Alberta, Canada T6G 2H1
Publication date: 1992-11-01
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