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. 2019 Feb 28;19:91. doi: 10.1186/s12870-019-1671-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 10 — Tentative model for the nucellar PCD during pollen chamber formation in G. biloba ovules. Ovules at the stage of pre-PCF (a) and post-PCF (b) are sectioned longitudinally. The black-boxed area in (a) contains nucellar cells at the micropylar end of ovule, which are to undergo PCD to generated a pollen chamber, bounded by the white-box in (b). Other nucellar cells, represented by a white-boxed area in (a), keep growth throughout the stages of PCF