Abstract
Abstract A general relationship was found between combined nitrogen nutrition and translocation pattern of 14C assimilates in an experiment carried out in greenhouse with soybean plant grown in nitrogen-free water culture and supplied with 40 ppm N in the form of NO3 -or NH4 + for 1 week before exposure to 14CO2 at initial pod filling stage. The longest the cold chase time after 14CO2 exposure, the highest the percentage of total recovered 14C was translocated from the leaves to the different plant parts. Ammonium cecreased the capacity of leaves for exportation of labeled photosynthates. A relatively high percentage of total recovered 14C was observed in the stems and pods of NO3 --treated plants as compared to NH4 +-treated plants, and the opposite was true with root system. In different plant parts except nodules, nitrate-treated plants had high specific radioactivities and ammonium-treated plants had low specific radioactivities compared with control. Among the different plant parts other than leaves,...
Published Version
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