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Nodules number (a), nodules weight (b), and acetylene reduction assay (ARA) (c) of Medicago truncatula genotypes grown in the presence of Fe (C), in the direct iron deficiency (DD), and in the induced iron deficiency (ID) during the treatment period (21 days). Values are the means of eight replicates ± SD at P<5%. Graphs denoted with different small letters are significantly different according to the Tukey test.
