Studies on the Physiology of Nodule Formation

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Abstract
Small amounts of nitrate or nitrite salts (10 μg N/plant) in the root medium of Trifolium glomeratum or T. repens delayed nodulation, prolonged the initial rapid phase of root infection and slightly stimulated lateral root formation, whereas equivalent quantities of ammonium sulphate or urea did not. Growth of roots and root hairs was unaffected by any of these substances at 10 μg N/plant. Altering the carbohydrate status of the clover seedlings by adding glucose to the root medium, or by changing day length or light intensity, influenced neither the stimulation of root-hair infection nor the delay in nodulation induced by nitrate at 10 fig N/plant, except that plants grown in total darkness had fewer hairs infected when the root medium contained small amounts of nitrate. The nitrogenous compounds at 100 μg to 1, 000 μg N/plant generally delayed and decreased nodulation, increased lateral root formation, slowed hair infection, and increased root growth.

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