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. 2019 Feb 28;9:3022. doi: 10.1038/s41598-019-39838-3

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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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The effect of cold or deregulation of plastidic ascorbate peroxidases on a subsequent cold trigger. (A) ZAT10 transcript levels in control plants (C), only cold-primed (P), only estradiol treated (E), only cold triggered (T) and cold-primed and cold-triggered (PT) and estradiol-treated and cold-triggered (ET) Col-0, sAPX-iOE, tAPX-iOE and tAPX-iRNAi plants of the same age. The tAPX-iRNAi ET plants were cold primed and sprayed with estradiol. The letters refer to distinct significance groups as determined by ANOVA (Tukey’s test, p < 0.05, n = 4 ± SD). (B) Priming effect. ZAT10 transcript abundance in cold (white) or by estradiol spraying (green) primed Col-0, sAPX-iOE and tAPX-iOE and tAPX-iRNAi lines after 24 h cold triggering (PT and ET, respectively) normalized on the transcript abundance in triggered only plants (T-plants). The tAPX-iRNAi plants were cold-primed and sprayed with estradiol (green-white striped). The crude data are identical to those in section A. for calculation of the means, standard deviations and the statistical analysis (one-sided t-Test p < 0.05; n = 4) the PT/T- and ET/T-ratios, respectively, were calculated independently for each biological replicate first. Different small letters show significance of difference in cold primability, different capital letters difference in the cold response after estradiol spraying. The asterisks label significantly different results between cold- and estradiol-priming.