Effect of illumination on the redox state of cytochrome c oxidase in wheat leaves in vivo |
| |
Authors: | M. S. Naik J. D. Nicholas |
| |
Affiliation: | (1) Department of Agricultural Biochemistry, Waite Agricultural Research Institute, University of Adelaide, 5064 Glen Osmond, South Australia |
| |
Abstract: | The redox states of cytochrome a3 in wheat leaves (Triticum aestivum L.), in light and in the dark were monitored by its reaction with CO, which resulted in the stimulation of the in vivo reduction of nitrate to nitrite by nitrate reductase under aerobic conditions. Illumination of the leaves for 10 min markedly stimulated the steady state reduction of cytochrome a3, probably associated with a decreased energization of the mitochondria in light. In the dark, during steady state respiration of the tightly coupled mitochondria, cytochrome oxidase was in a more oxidised state than in the light, as judged by its reaction with CO. It is also likely that in light, intra mitochondrial NAD+ will be highly reduced on account of a high phosphate potential. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|