Abstract
Thein vivo 14CO2 fixation assay and xylem sap analysis showed that inSesbania rostrata the transport of fixed nitrogen from stem nodules was in the amide form. The majority of nitrogen was transported as asparagine. The close relationship between nodule phosphoenolpyruvate carboxylase and nitrogenase activities suggested that nodule CO2 fixation contributed directly to nitrogen assimilation in stem nodules ofS. rostrata.
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