CHANGES IN ACTIVITY OF D-GLUCOSE-6-PHOSPHATE : NADP AND 6-PHOSPHO-D-GLUCONATE : NADP OXIDOREDUCTASES IN RELATION TO LIGNIFICATION OF BAMBOO
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概要
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D-Glucose-6-phosphate : NADP oxidoreductase (glucose-6-phosphate de-hydrogenase; EC, 1.1.1.49) and 6-D, hospho-D-gluconate : NADP oxidoreductase (r)-phosphogluconate dehydrogenase; EC I .1.1.44) were found to be present in immature bamboo. Optimal pHs of the glucose-6-phosphate- and 6-phosphogluconate dehydrogenases were found to be 8.0 and 8.5, respectively. Both enzymes were demonstrated to be NADP-specific and NADP could not be replaced by NAD. Fructose-6-phosphate was indirectly utilized after conversion to glucose-6-phosphate by glucose-6-phosphate isomerase coexisting in the enzyme preparation. Pattern of enzyme activity and of respiratory. breakdown of glucose-1-^<14^gt;C and glucose-6-^<14^gt;C were investigated in connection with lignification of bamboo and discussed in comparison with sugar metabolism of fungi-infected plant tissues. As for the changes in the enzyme activity with growth of bamboo, it was recognized that there was a tendency that the activity of both enzymes increased and was maintained at a certain level even in the aged tissues. In addition there was a drop of the C_6/C_1 ratio toward the tissues of lower parts containing considerable amount of lignin and this phenomenon was the same as that observed in pentose phosphate metabolism of fungi-infected plant tissues.
- 日本植物生理学会の論文
著者
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SHIMADA Mikio
Laboratory of Biochemical Control, Wood Research Institute, Kyoto University
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Shimada Mikio
Laboratory Of Biochemical Control Wood Research Institute Kyoto University
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Higuchi Takayoshi
Laboratory Of Wood Chemistry Faculty Of Agriculture Gifu University
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- CHANGES IN ACTIVITY OF D-GLUCOSE-6-PHOSPHATE : NADP AND 6-PHOSPHO-D-GLUCONATE : NADP OXIDOREDUCTASES IN RELATION TO LIGNIFICATION OF BAMBOO