Abstract
The higher yield obtained by C4 plants in comparison with C3 plants (Gifford, 1974) has been ascribed by Zelitch (1971) to be due in part to the absence of photorespiratory CO2 loss from the leaves of C4 plants. Mahon et al. (1974a, b) demonstrated that the photorespiratory CO2 loss from the leaves of C3 plants can be reduced when the CO2 concentration of the atmosphere surrounding those leaves is increased. Wong (1979) demonstrated in short term experiments that C3 and C4 plants growing under an elevated atmosphere CO2 concentration could obtain similar yields. We sought to determine whether the partitioning of carbon fluxes in a C3 plant was altered whilst it grew under elevated atmospheric CO2 concentrations.
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