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. 2010 Jun 30;61(13):3647–3662. doi: 10.1093/jxb/erq178

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© 2010 The Author(s).

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

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Fig. 1. — General view of Portulaca species (left panels), hand-made leaf cross-sections (middle panels), and distribution of chlorenchyma under the fluorescent microscope (right panels). (A–C) Portulaca umbraticola; (B) distribution of vascular bundles (VBs) in the median paradermal plane; (C) red fluorescence from chlorenchyma is distributed around each VB. (D–F) Portulaca oleracea; (E) zig-zag pattern in the distribution of VBs with their positioning in two paradermal levels, (F) fluorescent chlorenchyma surrounds the VBs. (G–I) Portulaca grandiflora and (J–L) P. amilis; (H, K) VBs are distributed around the leaf periphery, (I, L) chlorenchymatous cells are mostly on the outer side of the VBs. (M–O) Portulaca cf. bicolor; (N) VBs are only on the adaxial side, (O) chlorophyll fluorescence occurs on the adaxial and abaxial sides of VBs. (P–R) Portulaca cryptopetala; (Q) C₃-like dorsoventral type of anatomy, (R) chlorenchyma is distributed evenly in leaf section. H, hypoderm; VB, vascular bundles; WS, water storage tissue. Scale bars: 2 cm for A, D, G, J, M, P; 500 μm for B, E, H, K, N, Q; 250 μm for C, F, I, L, O, R.