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Lotus corniculatus, L. tenuis, L. pedunculatus, and L. subbiflorus inoculated with Mesorhizobium loti NZP2037 strain were grown in a growth chamber. The plants dry weight (DW), the nodule fresh weight (FW), the nitrogenase activity, the nodule glutamine synthetase (GS) and glutamate synthase (GOGAT) activities, as well as the leghemoglobin content and the amino acid in the stem were measured 28 days after inoculation. The highest DW of plants was measured in L. tenuis and the highest FW of nodules was measured in L. pedunculatus. Nitrogenase activity in L. tenuis, L. pedunculatus and L. subbiflorus was six fold the activity in L. corniculatus. Nodule GS and GOGAT activities did not follow this same pattern. L. tenuis had the highest values of GS and GOGAT activities in the nodule, and a high nitrogenase activity which is consistent with its high plant DW. The four species of Lotus were compared and no correlation between nitrogen fixation parameters and ammonia assimilation enzymes was found, but the GS/GOGAT ratio has a positive and significant correlation (r²=0.82**) with the amino acid content in stems. Plantas de Lotus corniculatus, L. tenuis, L. pedunculatus e L. subbiflorus foram inoculadas com Mesorhizobium loti cepa NZP2037 e mantidas numa câmara de crescimento. A massa seca da planta (MS), massa fresca dos nódulos (MF), atividade de nitrogenase, atividades de sintetase de glutamina (GS) e sintase de glutamato (GOGAT), bem como o teor de leghemoglobina e de aminoácidos no caule foram avaliados 28 dias após inoculação. A maior MS das plantas foi encontrada em L. tenuis e a maior MF de nódulos foi encontrada em L. pedunculatus. Atividade de nitrogenase em L. tenuis, L. pedunculatus e L. subbiflorus foi seis vezes a atividade em L. corniculatus. As atividades de GS e GOGAT nos nódulos não mostraram o mesmo padrão. As maiores atividades de GS e GOGAT foram encontradas nos nódulos de L. tenuis associadas com a alta atividade de nitrogenase, resultados compativeis com sua alta MS. As quatro espécies de Lotus foram comparadas e nenhuma correlação entre os parâmetros de fixação de nitrogênio e enzimas de assimilação de amonia foi encontrada, mas a razão GS/GOGAT tem uma correlação positiva e significativa (r²=0.82**) com o teor de aminoácidos nos caules

Glutamine synthetase and glutamate synthase activities in relation to nitrogen fixation in Lotus spp.