[en] Plants were grown in a controlled environment chamber and fed with a modified Hoagland solution containing nitrate as nitrogen source (N+ medium). Soybeans, 33 days old (flowering stage), 45 and 56 days old (pods formation and filling stages) were used for experimentation. In each experiment, the eight trifoliated leaf (F₈) was exposed to ¹⁴CO₂ (10 μCi; 400 vpm), in the light (80 W x m^-2) for 30 min. After a 6 h chase period (22 - 25⁰C; 80 W x m^-2), the radiocarbon distribution among plant parts was determined and labelled compounds were identified. (orig.)

[en] [1-¹⁴C]Glycolate metabolism was examined in leafy shoots of soybean plants (Glycine max (L.) Merr., var. Adepta). Only small amounts of ¹⁴C were incorporated into evolved carbon dioxide and glucidic compounds. Free and protein glycine was labelled but higher levels of radioactivity were found in free serine. Changes in the distribution of ¹⁴C with time showed that metabolic conversion glycollate → glycine → serine occurred very early and serine biosynthesis was more important in the shoot than in the leaves. Carbon dioxide labelling was always slight compared to serine labelling. These data suggest strong relations between glycollate and nitrogen metabolism