Stable-carbon isotopic composition of maple sap and foliage

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.78.2.427· OSTI ID:5887349

Leavitt, S W; Long, A

The /sup 13/C//sup 12/C ratios of Acer grandidentatum sap sugar collected during the dormant period are compared to those of buds, leaves, and wood developed over the following growing season. As the primary carbon source for cellulose manufacture at initiation of annual growth in deciduous trees, sap sucrose would be expected to have an isotopic composition similar to first-formed cellulose. Although constancy in concentration and /sup 13/C//sup 12/C ratios of the maple sap sugar suggests any gains or losses (e.g. to maintenance metabolism) do not appreciably alter composition, the /sup 13/C//sup 12/C ratios of cellulose of the enlarging buds in the spring are quite distinct from those of the sap sugar, seemingly precluding a simple direct biochemical pathway of sap sucrose-glucose-cellulose in favor of a more complex pathway with greater likelihood of isotopic fractionation. The /sup 13/C//sup 12/C ratios of the the leaves and in the growth ring were initially similar to the sap sugar but decreased steadily over the growing season.

• Research Organization: Univ. of Wisconsin-Parkside, Kenosha
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5887349
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 78:2; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
BIOLOGICAL PATHWAYS
CARBOHYDRATES
CARBON 12
CARBON 13
CARBON ISOTOPES
CELLULOSE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GLUCOSE
HEXOSES
ISOTOPE RATIO
ISOTOPES
LEAVES
LIGHT NUCLEI
MAPLES
MONOSACCHARIDES
NUCLEI
ORGANIC COMPOUNDS
PLANTS
POLYSACCHARIDES
SACCHARIDES
SEASONAL VARIATIONS
STABLE ISOTOPES
TREES
VARIATIONS