Effects of 2-Deoxygalactose on Auxin-Induced Growth and Levels of UDP-Sugars in Higher Plants

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Galactose inhibited the IAA-induced elongation of cells in segments of oat coleoptiles but not in segments of azuki bean and cucumber stems. In contrast, its analogs, 2-deoxygalactose and 2-deoxyglucose, inhibited the IAA-induced elongation of cells in these plant tissues. In segments of cucumber stems, 2-deoxygalactose inhibited formation of cell-wall polysaccharides with little effect on respiration in terms of either reduced consumption of O_2 Or levels of ATP. 2-Deoxygalactose and 2-deoxyglucose caused a rapid decrease in the levels of UTP and UDP-sugars with a concomitant increase in levels of UDP in cucumber segments. These results suggest that 2-deoxysugars inhibit synthesis of cell-wall polysaccharides by decreasing the levels of UDP-sugars, thereby inhibiting IAA-induced elongation of cells in cucumber segments. 2-Deoxysugars can, therefore, be used as potential inhibitors with which to assess the role of UDP-sugars in the IAA-induced elongation of cells in dicotyledonous plants.
日本植物生理学会の論文