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. 2014 May 28;14:148. doi: 10.1186/1471-2229-14-148

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Copyright © 2014 Yang et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Model of photoperiod flowering-time regulation in sorghum. Phytochrome B mediates light signaling, providing information about day length required for photoperiod detection. Light and the circadian clock regulate expression of PRR37 resulting in higher expression in LD vs. SD. PRR37, a floral repressor, inhibits the activity of SbCO, a floral activator resulting in delayed flowering in LD. In inductive SD, SbCO activates expression of SbEHD1, SbCN8 and SbCN12 genes thereby promoting flowering. Thin lines represent possible mechanism of flowering time regulation.