Abstract
Root nodules of common bean (Phaseolus vulgaris L. GN 1140) show different ontogenetic patterns of nitrogen fixation in different parts of the root system. The objective of the present study was to search for nodule physiological factors which could explain these differences. Plants were grown to maturity under controlled environment conditions. Root nodules were regularly harvested from two zones of the root system, and assayed for soluble cytosolic content and carbohydrate status. Nodule concentrations of soluble carbohydrates, glucose, fructose or sucrose, did not change significantly during the pod-filling decline in nitrogenase activity. Nodule concentrations of sucrose appeared more related to nodule ontogeny than to the ontogenetic stage of the shoot
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