Photophosphorylation and Carbon Dioxide Fixation by Chloroplasts Isolated from Populus deltoides
نویسندگان
چکیده
منابع مشابه
Energetic factors affecting carbon dioxide fixation in isolated chloroplasts.
Light- and HCO(3) (-)-saturated (10 millimolar) rates of O(2) evolution (120 to 220 micromoles O(2) per milligram chlorophyll per hour), obtained with intact spinach chloroplasts, are decreased up to 3-fold by changes in assay conditions such as omission of catalase from the medium, the use of high (>/=1 millimolar) inorganic phosphate, inclusion of NO(2) (-) as an electron acceptor, or bright ...
متن کاملCarbon dioxide fixation in the light and in the dark by isolated spinach chloroplasts.
Factors affecting CO(2) fixation in the spinach (Spinacia oleracea) chloroplast were investigated. Free magnesium ions are shown to be highly inhibitory for photosynthetic CO(2) fixation in isolated intact spinach chloroplasts. The pH optimum for CO(2) fixation is about 8.5 but is dependent upon the reaction medium. Conditions are defined under which chloroplasts illuminated in the absence of C...
متن کاملPhotosynthetic assimilation of carbon dioxide and acetate by isolated chloroplasts.
Chloroplasts isolated by methods similar to that described by Arnon et al. (1) are capable of incorporating acetate carbon into both lipid and n)on-lipid materials when fortified with appropriate cofactors (2, 3,4, 5). The actual rate of incorporation of acetate carbon in these preparations was, however, very small compared with the normal rate of photosynthesis (1-2 jumoles/mg chlorophyll'hr) ...
متن کاملFunctional and Structural Changes in Senescing Populus deltoides (Bartr.) Chloroplasts.
Chloroplasts isolated from Populus deltoides leaves were used to study age-dependent changes in the rate of cyclic photophosphorylation. Single leaves were used to measure CO(2) fixation by leaf discs, chlorophyll concentration, and ATP synthesis. The ability of chloroplasts to synthesize ATP diminished steadily from the time of full leaf expansion, regardless whether the results are expressed ...
متن کاملInhibition of photosynthetic carbon dioxide fixation in isolated spinach chloroplasts exposed to reduced osmotic potentials.
Reduced osmotic potentials inhibited the rate of CO(2) fixation by isolated intact spinach (Spinacia oleracea) chloroplasts. This inhibition was observed immediately after transfer of chloroplasts from a solution containing 0.33 m sorbitol to higher sorbitol concentrations, and the depressed rate remained constant. The inhibited CO(2) fixation could not be attributed to a decreased rate of phot...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1972
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.50.3.375