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Annals of Botany 23: 261-268, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

The Oxygen Factor in the Development and Function of the Root Nodules of Alder

J. T. MACCONNELL

Paisley Technical College

The effect of the supply of oxygen to the root systems of alder plants growing in water culture has been studied in experiments in which oxygen-nitrogen gas mixtures were bubbled through the culture vessels. When the root systems were inoculated with the nodule organism in the presence of different levels of oxygen it was found that the number of nodules was progressively reduced as the oxygen level was lowered from the normal 21 per cent.

In a second experiment the effect of the variation of oxygen supply on the growth of already nodulated plants and of non-nodulated plants, the latter supplied with combined nitrogen, was compared. The nodulated plants proved to be con-siderably more sensitive to oxygen reduction. It is concluded that oxygen supply is of special importance in the development and function of the alder nodule and the possible reasons for this are discussed.


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