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. 2016 Aug 9;2:16027. doi: 10.1038/celldisc.2016.27

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Copyright © 2016 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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A working model for the proposed action of DDM1-mediated regulation of heterosis through SA metabolism. (a) The promoter status of SA-related genes, SA transcripts abundance, SA concentration and phenotype of parents and F₁ in WT and ddm1 mutant background. (b) The effect of dose-dependent SA concentration over plant growth. The F₁ hybrids from WT Col and C24 possess SA gene expression/concentration in the optimum zone and, hence, BPH phenotype is seen. As ddm1 increases the ratio of active (green bars) to repressive (red bars) epigenetic marks in promoter elements, SA-related gene expression and SA concentration is increased in ddm1-parents. Thus, F₁ hybrids produced from the ddm1 background display supra-optimal SA concentrations and hence MPH phenotype is seen.