Abstract
Labelled carbon dioxide as 14 CO 2 was fed to the terminal raceme and the topmost (flag) leaf of field grown rapeseed plants ( Brassica napus L.) at different stages during reproductive development. Radio-activity in reproductive parts, pedicels and stem material in different sections of the terminal raceme was assessed immediately after labelling. Following feeding of the topmost leaf, plants were harvested after 24 h of 14 C translocation. Reproductive parts in the middle and upper regions of the terminal raceme fixed large amounts of 14 C compared to the basal ones. Carbon assimilated by the flag leaf during mid-late flowering was mainly recovered in the main stem. By comparison, during rapid pod filling 58% of labelled assimilates from this leaf were translocated to the reproductive organs carried by the first primary branch and terminal raceme.
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