Cover illustration: The cover inset shows a cross-section of maize adventitious root with lateral root formation in relation to aerenchyma under sulfate deprivation. The section was stained for ROS in the presence of a CuZn-SOD inhibitor. The lateral root exhibited ROS activity and suppressed aerenchyma formation in 4–5 surrounding cell layers. See Bouranis et al. (pp. 695–704).
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