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. 2016 Feb 4;4:e1653. doi: 10.7717/peerj.1653

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©2016 Rudall et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) Longitudinal section of developing anther, with sporogenous tissue in centre and anther wall layers starting to develop. (B) Longitudinal section of mature anther in unopened bud, with individual pollen grains in anther locule and anther wall layers well developed. (C) 2–3-nucleate pollen grains within anther locule. (D, F) Germinating pollen grains inside anther locule. (E) Longitudinal section of mature anther in unopened bud, showing germinating pollen grains in anther locule and pollen tubes in filament. Labels: al, anther locule; et, endothecial layer with wall thickenings; pt, pollen tube; tap, tapetum. Scale bars: in A, B = 50 μm, in D, F = 10 μm, in C, E = 20 μm.