The Cupric Ion as an Inhibitor of Photosynthetic Electron Transport in Isolated Chloroplasts 1
AUTOR(ES)
Cedeno-Maldonado, Arturo
RESUMO
Strong inhibition of uncoupled photosynthetic electron transport by Cu2+ in isolated spinach chloroplasts was observed by measuring changes in O2 concentration in the reaction medium. Inhibition was dependent not only on the concentration of the inhibitor, but also on the ratio of chlorophyll to inhibitor. Binding of Cu2+ to the chloroplast membranes resulted in removal of Cu2+ from solution. When chloroplasts were exposed to preincubation in light, there was increased inhibition as a result of Cu2+ binding to inhibitory sites. Preincubation in the dark resulted in Cu2+ binding to noninhibitory sites and decreased inhibition. The degree of inhibition was lower at low light intensities than at high light intensities.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366219Documentos Relacionados
- Effects of Disalicylidenepropanediamines on Photosynthetic Electron Transport of Isolated Spinach Chloroplasts
- Inhibition of Photosynthetic Electron Transport in Isolated Spinach Chloroplasts by Two 1,3,4-Thiadiazolyl Derivatives 1
- Zinc-inhibited Electron Transport of Photosynthesis in Isolated Barley Chloroplasts 1
- Photosynthetic Electron Transport in Isolated Maize Bundle Sheath Cells 1
- Photosynthetic electron transport in genetically altered photosystem II reaction centers of chloroplasts.
