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. 2016 Dec 5;173(1):36–46. doi: 10.1104/pp.16.01523

Figure 3.

Figure 3.

Mechanism by which SPL15 activates its target genes FUL and MIR172b during floral induction under short days. A, Activation of transcription requires SPL15 and the MADS box transcription factor SOC1. SOC1 recruits the trimethylation of Lys-27 on histone 3 (H3K27me3) demethylase REF6, allowing the removal of repressive chromatin marks from the target gene. SPL15 interacts with the Mediator complex to promote transcription through RNA Pol II. B, If GA levels are low at the meristem, DELLA protein levels are high. DELLA interacts with SPL15 at the target gene promoter, preventing the interaction of SPL15 with the Mediator complex. No transcription occurs. C, In the absence of SPL15, SOC1 binds to the target gene and REF6 is recruited, but no transcription occurs. The Mediator complex is not recruited to the target gene. D, In the absence of SOC1, SPL15 binds to the target gene but REF6 is not recruited. The repressive chromatin mark H3K27me3 remains on the gene, and no transcription occurs. Data in this figure are from Hyun et al. (2016).