In the study of mechanism of hormone action, the identification and localization of hormone receptors were important research fields. Cytokinin(CTK)-binding proteins, have been found from some cell fractions of severa...In the study of mechanism of hormone action, the identification and localization of hormone receptors were important research fields. Cytokinin(CTK)-binding proteins, have been found from some cell fractions of several kinds of plants since they were first found in ribosomes of Chinese-cabbage leaves in 1970.展开更多
The induction of NO3- to NO2- is catalyzed by an induced enzyme nitrate reductase （NADH:NR, E. C. 1.6.6.1） in the plant. In higher plants, nitrate and light are required for the induction of enzyme activity. NR acti...The induction of NO3- to NO2- is catalyzed by an induced enzyme nitrate reductase （NADH:NR, E. C. 1.6.6.1） in the plant. In higher plants, nitrate and light are required for the induction of enzyme activity. NR activity cannot be induced in etiolated seedlings except when glucose is supplied in the induction solution, which has been considered to be probably due to the energy level in vivo.But we did find that when the pH of the induction solution containing nitrate was below 5, higher展开更多
Nitrate raductase (NADH:NR E. C. 1.6.6.1) is a substrate-indueible enzyme in plants. NR acts as a key role in nitrogen assimilation, and also has important effects on the other metabolism. A close relation between NR ...Nitrate raductase (NADH:NR E. C. 1.6.6.1) is a substrate-indueible enzyme in plants. NR acts as a key role in nitrogen assimilation, and also has important effects on the other metabolism. A close relation between NR activity and energy level in vivo has been noted. But in the previous reports only the effect of ATP on NR activity has been studied. There is no information about the action of NR activity on ATP formation. This study shows that ATP level in wheat and rice is enhanced by NR activity and that the cultivars with different nitrogen responses vary in their ATP contents corresponding to the variation of NR activity.展开更多
Nitrate assimilation in green algae and higher plants is closely related to photosynthetic CO<sub>2</sub> fixation. Photosystems in chloroplast provide reducing power and ATP for both processes. They can a...Nitrate assimilation in green algae and higher plants is closely related to photosynthetic CO<sub>2</sub> fixation. Photosystems in chloroplast provide reducing power and ATP for both processes. They can also interact with each other through the exchange of intermediate compounds such as carbon skeletons and amino acids. Furthermore, of the four enzymes involved in nitrate assimilation, three are located in chloroplast.展开更多
文摘In the study of mechanism of hormone action, the identification and localization of hormone receptors were important research fields. Cytokinin(CTK)-binding proteins, have been found from some cell fractions of several kinds of plants since they were first found in ribosomes of Chinese-cabbage leaves in 1970.
文摘The induction of NO3- to NO2- is catalyzed by an induced enzyme nitrate reductase （NADH:NR, E. C. 1.6.6.1） in the plant. In higher plants, nitrate and light are required for the induction of enzyme activity. NR activity cannot be induced in etiolated seedlings except when glucose is supplied in the induction solution, which has been considered to be probably due to the energy level in vivo.But we did find that when the pH of the induction solution containing nitrate was below 5, higher
文摘Nitrate raductase (NADH:NR E. C. 1.6.6.1) is a substrate-indueible enzyme in plants. NR acts as a key role in nitrogen assimilation, and also has important effects on the other metabolism. A close relation between NR activity and energy level in vivo has been noted. But in the previous reports only the effect of ATP on NR activity has been studied. There is no information about the action of NR activity on ATP formation. This study shows that ATP level in wheat and rice is enhanced by NR activity and that the cultivars with different nitrogen responses vary in their ATP contents corresponding to the variation of NR activity.
文摘Nitrate assimilation in green algae and higher plants is closely related to photosynthetic CO<sub>2</sub> fixation. Photosystems in chloroplast provide reducing power and ATP for both processes. They can also interact with each other through the exchange of intermediate compounds such as carbon skeletons and amino acids. Furthermore, of the four enzymes involved in nitrate assimilation, three are located in chloroplast.
