Abstract
More ethanol soluble material (carbohydrate and amino nitrogen) was found in both host cell and bacteroid components of Phaseolus vulgaris nodules from plants grown at 28 W/m 2 than from plants grown at 7 W/m 2. The range of compounds identified was similar at the two irradiances. On feeding 14CO 2 to the plant tops at either irradiance the labelling patterns of carbohydrates and organic acids in the nodule host cells and bacteroids suggested that any or all of the following substances could be donated by the host to the bacteroids for general metabolism: sucrose, fructose, glucose, an unidentified carbohydrate, malic acid and an organic acid co-chromatographing with 6-phosphogluconate. Distribution and labelling patterns of nodule amino compounds were consistent with the hypothesis that ammonia is the primary product of nitrogen fixation within bacteroids, and that this ammonia is transported to host cells for assimilation, initially into glutamine and glutamate.
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