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Electron microscopy showing cross sections through interface of mesophyll and BS of leaves of wild type (A) and PEPC mutant (B) with plants grown at 10 mbar CO2. M, Part of mesophyll cell; BS, part of BS cell; W, cell wall; IS, intercellular air space. Arrows point to plasmodesmata. Scale bar = 0.5 μm. The average thickness of BS cell wall in contact with intercellular air from several sections was 0.34 μm for wild type and 0.32 μm for mutant (n = 3).
