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. 2018 Nov 13;18:281. doi: 10.1186/s12870-018-1512-1

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© The Author(s). 2018

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. 6 — A model of the roles of ROXYs in nitrate starvation signaling. a Under nitrate-deficient conditions, ROXY6,8,9,19–21 are upregulated, while ROXY10–17 are downregulated. ROS may be a signaling component that regulates the expression of some of these ROXY genes. b Based on gain-of-function data, ROXY15 or its paralogs, which are upregulated under nitrate-sufficient conditions, might increase chlorophyll content and inhibit root hair elongation, and downregulate the transcription of NRT2.1 while ROXY9 or its paralogs, which are upregulated under nitrate-deficient conditions, might reduce chlorophyll content and promote root hair elongation, and upregulate the transcription of NRT2.1. Up arrow, increase; down arrow, decrease; T-bar, inhibition