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Whither aerenchyma?
Although widely recognized for its role in oxygen transport to submerged tissues, the cortical aerenchyma in plants that undergo secondary growth is often sloughed off, breaking the continuity between submerged and non-submerged tissues. Stevens et al. (pp. 621-625) show that an additional pathway for oxygen transport exits in the phellem of Lythrum salicaria (L.), and examine its contribution to plant performance.
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