Carbohydrate levels in current-year shoots of sugar maple

John R. Donnelly

Treesearch

Carbohydrate levels in current-year shoots of sugar maple

Informally Refereed

Authors:

John R. Donnelly

Year:

1976

Type:

Research Paper

Station:

Northern Research Station

Source:

Res. Pap. NE-347. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 6p.

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Download (PDF 622 KB): https://research.fs.usda.gov/download/treesearch/15547.pdf

Abstract

Diurnal changes in carbohydrate concentrations in leaves and current-year stems of a mature sugar maple tree were studied in June and September. In leaves, alcohol-soluble sugar concentration was highest in the morning and lowest in late afternoon or early evening; diurnal changes in starch lagged about 5 hours behind changes in sugar. Carbohydrate concentrations in current-year stems did not vary diurnally. Leaves weighed much more than current-year stems and contained a higher concentration of sugar and starch. In leaves, sugar concentration was higher in September than it had been in June; starch concentration was much higher in June. The opposite was true for current-year stems; sugar concentration was slightly lower in September than it had been in June, but starch concentration was much higher.

Citation

Donnelly, John R. 1976. Carbohydrate levels in current-year shoots of sugar maple. Res. Pap. NE-347. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 6p.