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C4-acids as the source of carbon dioxide for calvin cycle photosynthesis by bundle sheath cells of the C4-pathway species Atriplex spongiosa
Authors:T Kagawa  MD Hatch
Institution:Division of Plant Industry, CSIRO, Post Office Box 1600, Canberra City, A.C.T. 2601, Australia
Abstract:For one group of C4 species we have proposed that the C4 acid decarboxylation phase of C4 photosynthesis proceeds via a NAD ‘malic’ enzyme located in bundle sheath mitochondria. The present studies with Atriplex spongiosa demonstrate the capacity of isolated mitochondria and bundle sheath cell strands to decarboxylate malate at rates commensurate with an integral role in photosynthesis. With bundle sheath cells, rates of H14CO3? fixation into Calvin cycle intermediates and evolution of O2 when HCO3? was added, were above 2 μmoles/min/mg chlorophyll. Similar rates of O2 evolution resulted from the addition of C4 acids, and the C-4 carboxyl of malate was rapidly assimilated into photosynthetic intermediates and products.
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