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SEM micrographs and Pb localization at transverse sections in root meristem zone cells exposed to 50 μmol/L Pb for 24 h. a: Transverse section of meristem zone (scale bar = 200 μm), b: Protoderm (scale bar = 20 μm), c–e: Ground meristem (scale bar = 20 μm), f: Procambium (scale bar = 20 μm). *cell wall, cytoplasm, P: protoderm, G: ground meristem, and Pc: procambium
