Abstract
The incorporation of radioactive carbon into various photosynthetic products was investi gated with tomato plants in atmospheres containing between 40 and 1400 parts/106 carbon dioxide. A significantly greater proportion of 14C entered sucrose and alcohol-insoluble material at high concentrations of carbon dioxide. Incorporation into glycine and serine was significantly greater at lower carbon-dioxide concentrations. The pool size of these inter mediates was also determined and it was concluded that in the presence of high partial pressures of carbon dioxide the flow of carbon from the photosynthetic cycle through the C2 pathway is decreased.
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