Summary
The low molecular-weight carbohydrates sucrose, d-glucose, d-fructose, myoinositol, O-α-d-galactopyranosyl-(1→1)-myoinositol, raffinose, d,l-inositol, stachyose, α,α-trehalose and d-galactose (in decreasing order of percentage by weight) were isolated from the cambial sap of the beech (Fagus silvatica L.). The acidic compounds glucose-6-phosphate, glucose-1-phosphate, fructose-1,6-diphosphate, malic acid and oxalic acid were also tentatively identified.
Practically the only difference between the cambial saps of beech trees felled at different times during the period of most active secondary growth was in their content of myoinositol and an as yet unidentified extremely labile basic substance (BF 2). The content of both these substances increased greatly towards the end of the growing season. The cambial sap of any tree differed little from that of the xylem which had already begun to differentiate. On the other hand the cambial sap next to the bark and the phloem sap had a completely different composition. In the former sucrose constituted ca. 90% and in the latter practically 100% of the neutral, water-soluble fraction.
A comparison of the cambial saps of beech and a number of other deciduous trees brought to light a number of characteristic differences that appeared to be chemotaxonomically significant. Trehalose and d,l-inositol were detected only in the genus Fagus and never in the closely related genus Nothofagus. The presence of large amounts of stachyose and mannitol was characteristic for Fraxinus, and a high content of 2-O-methyl-l-inositol was typical of Acer. Galactose was not detected in all trees studied.
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Oesch, F. Die niedermolekularen Kohlenhydrate und Polyole im Cambialsaft der Buche (Fagus silvatica L.) und einiger anderer Laubbäume. Planta 86, 360–380 (1969). https://doi.org/10.1007/BF00388962
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DOI: https://doi.org/10.1007/BF00388962