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Oxygen profiles in the water column adjacent to (A) living adventitious roots (n = 4), (B) dead adventitious roots (n = 3) and (C) the background board without roots (n = 4) in darkness at 25 °C. Values are given as the mean ± s.e. By using an O2 microelectrode (tip diameter 10 μm), underwater profiling was conducted towards a point of the adventitious root; the point was approx. 10 mm away from the point of attachment of the adventitious root to the stem of Alternanthera philoxeroides.
