Evaluation of nitrogen fixation by different strains of theAzolla-Anabaena symbiosis in the presence of a high level of ammonium |
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| Authors: | N Okoronkwo C van Hovel D L Eskew |
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| Institution: | (1) Laboratoire de Physiologic Végétale, Université Catholique de Louvain, Place Croix du Sud 4, B-1348, Louvain-la-Neuve, Belgium;(2) FAO/IAEA Agricultural Biotechnology Laboratory, A-2444 Seibersdorf, Austria |
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| Abstract: | Summary The proportion of N derived from N2 fixation for 99 strains ofAzolla spp. (comprising all known species) in the presence of ammonium (40 mg/1) was assessed using a15N-dilution technique. The percentage of N derived from air varied from 29.5% to 79.9%. Although the N concentration ofAzolla spp. was not correlated with fertilizer N, it correlated fairly well with N2 fixation. Regression analysis suggests that the N yield ofAzolla spp. is more dependent on N2 fixation than on ammonium assimilation. The high correlation between N yield and isotopically determined, fixed N2 indicates that the N yield could be used as a parameter in the selection ofAzolla spp. strains that are capable of maintaining high N2 fixation in the presence of a high level of ammonium. |
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| Keywords: | Ammonium assimilation Azolla spp Dinitrogen fixation Productivity-N content N yield 15N dilution technique |
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