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Redox changes in roots of M. truncatula seedlings, inoculated with S. meliloti or with P. putida. Roots of 4 d-old Medicago seedlings were inoculated with S. meliloti (S.mel) or P. putida (P.put). ROS production was assayed and quantified 4, 24 and 48 h after inoculation as described in Figure 1. Numbers above bars indicate h.p.i. Error bars indicate standard deviation of the mean (n = 8) from two separate assays.
