
doi: 10.1038/181717a0
THE three genera comprising the Elaeagnaceae, namely, Elaeagnus, Hippophae and Shepherdia have been known for some time to bear root nodules; but it is only within the past few years that the physiological significance of these structures has been rigorously investigated. Previously, the main interest had been cytological. Nodules of Hippophae1,2 and Shepherdia3 have recently been shown, by growth experiments and by tests with nitrogen-15, to be able to fix nitrogen.
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