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. 2019 Nov 21;19:507. doi: 10.1186/s12870-019-2110-6

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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. 5 — Interactive effects of exogenous melatonin and selenium on stomatal opening. Scanning electron microscope (SEM) images of stomata showed the responses of exogenous MT on the stomatal aperture of Brassica napus leaves under Se stress. a and b showing full opening of leaves stomata under no stress conditions. c and d showed the complete closure of leaves stomata under maximum Se (200 μM) stress conditions. e and f illustrated the maximum stomatal opening at 50 μM Se + 100 μM MT than other Se + MT treatments