Sugar contents in parts of fruit of satsuma mandarin [Citrus reticulata] tree under water stress in autumn
1996
Mukai, H. (Shizuoka Univ. (Japan). Faculty of Agriculture) | Takagi, T. | Teshima, Y. | Suzuki, T.
Satsuma mandarin trees were water-stressed severely (WS-s) and moderately (WS-m) by withholding in autumn. Sugar contents of juice and peel were determined by HPLC. Sucrose and reducing sugars in the juice and peel were increased by the water stress treatment, notably, fructose in the peel. Increase of sucrose in the juice and peel was inhibited by WS-s. Total and reducing sugar concentrations in the peel from the WS-s plot were lower than those from the WS-m plot at harvest on November 26. Although the sugar content of the stylar end of the fruit was greater than that of the stem end, the % reducing sugars in the stem and was consistently higher than that of the stylar end. This relationship was not changed by water stress treatment. The peel color gradient from the stylar to the stem ends paralleled that of the sugar gradient; the gradient for titratable acidity was the reverse
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