E. camaldulensis, およびE. globulus におけるヘミセルロースを構成する中性糖モル比の樹幹内変異と標準値を示す位置について

ユーカリの材質育種における選抜指標抽出に関する研究 (第4報)

抄録

Molar ratio of neutral sugars constituting hemicellulose were analysed for Eucalyptus camaldulensis and E. globulus to do quality breeding using an increment core without cutting the tree.
For E. camaldulensis, glucose, xylose and galactose had the tendency of higher ratio in pith side, in pith side and lower parts, and in bark side and upper parts of the trunk, respectively. But rhamnose had almost no within-tree variation, and arabinose and mannose did not have the tendency. For E. globulus, glucose and xylose had the tendency of higher ratio in bark side, and in pith side respectively. But galactose did not have the tendency, and rhamnose, arabinose and mannose had almost no within-tree variation.
The whole-tree values were as follows ; glucose : xylose : galactose : rhamnose : arabinose : mannose = 13.8 : 51.1 : 20.4 : 0.7 : 7.8 : 6.3, and 12.3 : 69.4 : 13.2 : 0.6 : 2.9 : 1.6 in E. camaldulensis, and 12.1 : 61.4 : 16.1 : 1.0 : 3.6 : 5.8 and 9.4 : 77.2 : 5.8 : 1.0 : 2.7 : 3.9 in E. globulus. Since the ratio of xylose, considered as xylan, would be higher in E. globulus, hemicellulose in E. globulus could remain more after kraft pulping.
Under 3.3 m, representative heights, the whole-tree values ± 5%, were glucose : 2.8 3.3 m, xylose : 3.3 m, galactose : 2.3 m, rhamnose : 0.3 3.3 m, arabinose : 2.8 m, and mannose : 1.8m for E. camaldulensis. And 1.32.8m, 0.30.8m, 3.3 m, none, 0.33.3m, 1.33.3m, and 1, 8 m for E. globulus. These heights did not relate to the whole-tree height and the difference of within-tree variation.
It is expected that whole-tree pulp properties are predicted by the increment core taken from these representative heights.