Inhibition of the Photosynthetic Activities of Isolated Spinach Chloroplasts by Phosphonate Compounds

摘要: The effects of three closely related phosphonate compounds on several photosynthetic activities isolated chloroplasts were investigated. Phosphonoformic and phosphonopropionic acid found to inhibit both CO2 fixation the reduction 3-phosphoglyceric acid, with being more sensitive. In contrast, phosphonoacetic was only slightly inhibitory. lack inhibition appeared be due its inability enter stroma via phosphate translocator. Measurements changes in stromal metabolite levels following by either phosphonoformic or indicated that activity ribulose bisphosphate carboxylase/oxygenase reduced. Studies enzyme confirmed these effective competitive inhibitors carboxylase enzyme.