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Plant and Cell Physiology, 1991, Vol. 32, No. 3 433-438
© 1991

Article

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

Masahiro Inouhe1 and Ryoichi Yamamoto2

1Department of Biology, Faculty of Science, Ehime University Matsuyama, 790 Japan
2Laboratory of Biology, Tezukayama College Nara, 631 Japan

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 O2 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.

(Received September 27, 1990; Accepted February 5, 1991)
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