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1987•PLANT PHYSIOLOGYOpen access

Evidence for Inorganic Carbon Transport by Intact Chloroplasts of Chlamydomonas reinhardtii

James V. Moroney, Masahiko Kitayama, Robert K. Togasaki, N. E. Tolbert

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Abstract

Isolated intact chloroplasts from wall-less mutants of Chlamydomonas reinhardtii accumulate inorganic carbon (C(i)) from the medium provided the cells had been adapted to low CO(2) photoautotrophic growth conditions. Chloroplasts from cultures grown on high (5%) CO(2) or photoheterotrophically with acetate did not accumulate inorganic carbon. Chloroplast C(i) accumulation from low CO(2) grown cells was light dependent and was inhibited by uncouplers and inhibitors of electron transport. In a model for C(i) accumulation by Chlamydomonas, it is proposed that CO(2) diffuses into the cell and C(i) accumulation occurs in the chloroplast.

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Isolated intact chloroplasts from wall-less mutants of Chlamydomonas reinhardtii accumulate inorganic carbon (C(i)) from the medium provided the cells had been adapted to low CO(2) photoautotrophic growth conditions. Chloroplasts from cultures grown on high (5%) CO(2) or photoheterotrophically with acetate did not accumulate inorganic carbon. Chloroplast C(i) accumulation from low CO(2) grown cells was light dependent and was inhibited by uncouplers and inhibitors of electron transport. In a model for C(i) accumulation by Chlamydomonas, it is proposed that CO(2) diffuses into the cell and C(i) accumulation occurs in the chloroplast.

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Available abstract

Isolated intact chloroplasts from wall-less mutants of Chlamydomonas reinhardtii accumulate inorganic carbon (C(i)) from the medium provided the cells had been adapted to low CO(2) photoautotrophic growth conditions. Chloroplasts from cultures grown on high (5%) CO(2) or photoheterotrophically with acetate did not accumulate inorganic carbon. Chloroplast C(i) accumulation from low CO(2) grown cells was light dependent and was inhibited by uncouplers and inhibitors of electron transport. In a model for C(i) accumulation by Chlamydomonas, it is proposed that CO(2) diffuses into the cell and C(i) accumulation occurs in the chloroplast.

Key concepts: Chlamydomonas reinhardtii, Chloroplast, Chlamydomonas, Biophysics, Carbon fibers, Electron transport chain, Chemistry, Chloroplast membrane

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Evidence for Inorganic Carbon Transport by Intact Chloroplasts of Chlamydomonas reinhardtii — Research Paper | ScholarLens