Fig. 2: Putative model of heterosis triggered by epigenetics. | Horticulture Research

Fig. 2: Putative model of heterosis triggered by epigenetics.

From: Molecular basis of heterosis and related breeding strategies reveal its importance in vegetable breeding

Fig. 2

A DNA methylation: De novo methylation was catalyzed by DRM2, a homologous enzyme of DNMT3. In maintenance methylation, CG is catalyzed by MET1, a homologous enzyme of DNMT1; CHG is catalyzed by CMT3; and CHH is still catalyzed by DRM2. B Small RNA: Includes the miRNA produced by premiRNA and the siRNA produced by dsRNA. In general, 24 nt-siRNA mediates de novo DNA methylation catalyzed by the AGO4 protein. C Histone modifications: The modifications of histone amino acid residue includes acetylation, phosphorylation, methylation, and ubiquitination processes. Epigenetic modifications are produced by the parents. New epigenetic modifications may occur in F1 hybrids. D Epigenetic modification status of the parents and F1 hybrid: the increase and decrease in or recombination of epigenetic modifications induces the F1 hybrid to exhibit heterosis

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