DISTURBED SUGAR METABOLISM IN A FULLY HABITUATED NONORGANOGENIC CALLUS OF BETA-VULGARIS (L)

Habituated (H) nonorganogenic sugarbeet callus was found to exhibit a disturbed sugar metabolism. In contrast to cells from normal (N) callu s, H cells accumulate glucose and fructose and show an abnormal high f ructose/glucose ratio. Moreover, H cells which have decreased wall com ponents, display lower glycolytic enzyme activities (hexose phosphate isomerase and phosphofructokinase) which is compensated by higher acti vities of the enzymes of the hexose monophosphate pathway (glucose-6-p hosphate dehydrogenase and 6-phosphogluconate dehydrogenase). The dist urbed sugar metabolism of the H callus is discussed in relation to a d eficiency in H2O2 detoxifying systems.