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. 2016 Jan 4;29:165–177. doi: 10.1007/s00497-015-0273-3

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© The Author(s) 2016

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.

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Fig. 3 — Dynamics of pollen tube growth and double fertilization in cowpea. a Stigma showing pollen tube germination (arrows) 3 h after cross-pollination. b Pollen tube (arrow) having reached the micropyle of a fully differentiated ovule. c Fertilization of the central cell; a sperm cell nucleus (arrow) is visible within the primary endosperm polar nucleus; the egg cell has acquired a zygotic-like morphology. d Fertilization of the egg cell; a sperm cell (arrow) is adjacent to the egg cell membrane (arrowhead). e Fertilization of the egg cell; a sperm cell nucleus (arrow) is visible within the egg cell cytoplasm. CC central cell, EC egg cell, PN polar nucleus. Scale bars a = 40 μm; b = 50 μm; c–e = 20 μm