Abstract
Abstract Individual leaves of Lupinus albus were exposed to 14CO2 at various times and positions during growth. Stems were found to be major sites of 14C accumulation at all stages of growth even when seeds were also important accumulators of carbon. There was relatively little transfer of 14C from lower to upper branch orders. Stems, pods, and seeds received 14C mainly from leaves inserted on the same branch or from the leaves of the next highest order branch arising from it. Transfer of 14C to main stem components from the leaves of second and third order lateral branches was important however. Early-fixed, remobilised 14C made little contribution to seed weight. It was concluded that competition for carbon between stems and reproductive growth reduced the proportion of photosynthate used for seed production of L. albus. The high commitment of photosynthate from higher order lateral branches to growth lower in the canopy is probably the reason why vegetative growth of the upper canopy is sensitive to mi...
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