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This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
GUS staining of A. thaliana leaves transformed with a PLA2β promoter::GUS fusion construct. (A–C) GUS expression pattern in the intact leaf, bar = 200 μm (A), peeled epidermis, bar = 10 μm (B), and leaf cross-sections, bar = 20 μm (C). Guard cells are indicated by arrows (C).