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. 2019 Jul 3;9:9603. doi: 10.1038/s41598-019-45794-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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A negative cis-regulatory region of Ghd8 regulates its expression level. (a) Schematic diagram of the Ghd8-1 allele driven by two types of the Ghd8 promoter, where the sequence variations are indicated. NN and ZN indicate the construct with the promoter type Pro13-1469 from Nipponbare and Pro3-1186 from ZS97, respectively. (b,d) Expression profiles in the NN and ZN transgenic plants under LD and SD conditions. The white and black bars represent light and dark periods, respectively. The zeitgeber times (ZT) on the axis are corresponding to the sampling times. Leaf samples were collected every 4 h from 35-day-old plants. (c) Heading date of the transgenic lines and ZS97 under SD and LD conditions. (e) Photosensitivity of the transgenic lines and ZS97. Different letters indicate significant difference among the lines by the Tukey’s HSD test at p < 0.05. Error bars indicate the mean ± SD with three replicates.