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Autocatalysis in a Reconstituted Chloroplast System

David A. Walker and Ross McC. Lilley
Plant Physiology
Vol. 54, No. 6 (Dec., 1974), pp. 950-952
Stable URL: http://www.jstor.org/stable/4263851
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Autocatalysis in a Reconstituted Chloroplast System
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Abstract

In whole plants and intact chloroplasts, photosynthesis does not reach its full rate immediately upon illumination but only after a lag which is believed to reflect an autocatalytic increase in the concentration of carbon cycle intermediates. Autocatalysis has now been observed in a reconstituted system containing envelope-free chloroplasts augmented with ferredoxin and other stromal proteins but only catalytic amounts of ATP and NADP. With ribose 5-phosphate as substrate, the CO2 dependent O2 evolution recorded for such mixtures implies rates of "endogenous" or ferredoxin-dependent photophosphorylation as high as 360 μmoles of orthophosphate esterified mg-1 chlorophyll hr-1.

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