Abstract
AN intensive fixation of atmospheric nitrogen takes place not only in the root nodules of leguminous plants but also in those of the alder1. For example, in a quartz sand culture of Alnus glutinosa with no combined nitrogen the growth was 261 cm. in length and the increase of nitrogen in the plant about 6.5 gm. in the second year (Virtanen and Saubert-v. Hausen). In order to gain information on the mechanism of the atmospheric nitrogen fixation and the nitrogen metabolism in general we have examined the seasonal occurrence of free amino-acids in the different parts of A. glutinosa and A. incana.
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References
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VIRTANEN, A., MIETTINEN, J. Free Amino-Acids in the Leaves, Roots and Root Nodules of the Alder (Alnus). Nature 170, 283–284 (1952). https://doi.org/10.1038/170283a0
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DOI: https://doi.org/10.1038/170283a0
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