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Root Respiration in White Spruce (Picea glauca [Moench] Voss) Seedlings in Relation to Morphology and Environment ¹

Department of Biology, University of Victoria, Victoria, B.C., Canada, V8W 2Y2

Roots of white spruce seedlings (Picea glauca [Moench] Voss) undergo respiratory changes during the year that are related to changing metabolic requirements. An alternative pathway is always present, functions during most of the year, and operates maximally during periods of root and shoot growth. Although some differences in respiration and the apportioning of respiration can be correlated to root morphology, the environment and the stage of shoot development are also important controls. Differences in respiration related to root morphology are not manifest in mitochondrial structure, but overall rates were found to correlate with the number of mitochondria present. Root respiration in seedlings grown under root growth capacity conditions reflects root and shoot growth at that time rather than root growth capacity.

¹ Supported by the Natural Sciences and Engineering Research Council of Canada through a postgraduate scholarship to A. M. J.-F. and Grant A-1982 to J. N. O.