Characterization of a Photosynthetic Mutant Strain of Chlamydomonas Reinhardi Deficient in Phosphoribulokinase Activity

Overview

Journal Plant Physiol

Specialty Physiology

Date 1970 Oct 1

PMID 16657508

Citations 29

Authors

B Moll

R P Levine

Affiliations

Soon will be listed here.

Abstract

A mutant strain of the unicellular green alga, Chlamydomonas reinhardi, is unable to fix carbon dioxide by photosynthesis because it is deficient in phosphoribulokinase activity. The absence of light-dependent carbon dioxide fixation in cells of the mutant strain supports the operation of the Calvin-Benson scheme of photosynthetic carbon dioxide fixation in this organism. No deficiency other than low phosphoribulokinase activity was found which would account for the inability of cells of the mutant strain to fix carbon dioxide by photosynthesis. Activities comparable to those in the wild-type strain were found for eight other enzymes of the Calvin cycle and two enzymes associated with the C(4) dicarboxylic acid pathway. The normal rates of nicotinamide adenine dinucleotide phosphate photoreduction and of photosynthetic phosphorylation observed in chloroplast fragments prepared from cells of the mutant strain indicated that the photosynthetic electron transport chain in the mutant is intact.

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