Summary
Alnus glutinosa andAlnus rubra growing in the field in Scotland show specific nitrogenase activities of the same order of magnitude. The period of maximum potential nitrogenase activity coincides with that of maximum growth in late Spring and Summer. It is suggested that the retention of nitrogenase activity into the Autumn when growth has virtually ceased may be important as a contribution to the nitrogenous reserves of the tree.
Bioassay of different Scottish soils, all collected from the locality of natural stands ofAlnus glutinosa, showed wide variation in the nodulation of seedlings, although generally a soil poor for nodulation ofAlnus glutinosa generally gave poor nodulation ofAlnus rubra. Soils of pH 4.5 to 6.5, best suited for growth and nitrogen fixation of the two species, often gave nodules showing highest specific nitrogen fixing activity. Young (2 to 3 year old) plants in glasshouse or controlled environment cabinet, inoculated withAlnus glutinosa endophyte, differed from mature field grown plants, however, sinceAlnus rubra required a much larger (up to 2.5 times) mass of root nodules to fix a unit quantity of N. Microscopic comparison of the nodules of glasshouse plants showed that the proportion of cells containing the vesicular (nitrogen fixing) form of the endophyte was only slightly lower inAlnus rubra than inAlnus glutinosa and it is suggested that the differences in specific nitrogen fixing activity between the two species may reflect some incompatibility of function of theAlnus glutinosa endophyte when in symbiosis withAlnus rubra.
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Wheeler, C.T., McLaughlin, M.E. & Steele, P. A comparison of symbiotic nitrogen fixation in Scotland inAlnus glutinosa andAlnus rubra . Plant Soil 61, 169–188 (1981). https://doi.org/10.1007/BF02277373
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DOI: https://doi.org/10.1007/BF02277373