If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email firstname.lastname@example.org
Stems from two hybrid Populus clones were collected from September to May to determine the effect of harvest date and sampling position on carbohydrate availability. Total sugars increased to a December maximum of 25 percent of dry weight in the shoot tip, then declined through early spring. Raffinose concentrations increased to 7 percent and stachyose to 6 percent of dry weight in December; less than 0.2 percent of both sugars were present in September and May. Sucrose levels were highest in early March, up to 10 percent of dry weight. Concentrations of fructose, glucose, myo-inositol, and melibiose remained less than 1 percent of dry weight during the entire year. Maximum starch content of 7 percent was measured in clone 5262 in early October and 12 percent in clone 5334 in early September. Total carbohydrates ranged from 4.3 to 27.2 percent of dry weight, with significantly lower levels in September and May. Concentrations of sugars and starch were significantly greater at upper shoot positions. Total quantities of sugars and starch were greatest in the larger basal stem sections, and thus in cuttings harvested from lower shoot positions. Starch content was higher and sugar content lower in hardwood cuttings stored at 2° and -3° for 5 to 7 months, when compared with cuttings stored at - 10° and -20°. During storage and soaking, interconversions occurred between starch and sugars, and among sugars. Forest Sci. 30:999-1010.
Dean, College of Forest Resources, University of Maine, Orono, ME 04473
Publication date: December 1, 1984
More about this publication?
Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.