Seasonal patterns of carbohydrate reserves in red spruce seedlings
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Tree Physiology. 20: 549-555.
We studied seasonal dynamics of carbohydrate storage in red spruce (Picea rubens Sarg.) seedlings by measuring starch and sugar concentrations of old needles (≥one year old), new needles (< one year old), stems, and roots in two stands in the Green Mountains of Vermont. Although the two stands differed in many site characteristics including percent slope, aspect, soil type, drainage, and 564 m in elevation, concentrations and seasonal patterns of carbohydrates were similar for the two stands. For all tissues, starch concentrations peaked in late spring, declined through summer, and reached a minimum in winter. Sugar concentrations were greater than starch concentrations in all months except May and June. Sugar concentrations peaked in winter, and old needles showed a significant increase in sugar concentration between February and March. This increase in sugar concentration occurred without any reduction in localized starch concentrations or reductions in sugar or starch concentrations in new needles, stems or roots.
Schaberg, P.G.; Snyder, M.C.; Shane, J.B.; Donnelly, J.R. 2000. Seasonal patterns of carbohydrate reserves in red spruce seedlings. Tree Physiology. 20: 549-555.