SDG8 and SDG26 located closely on Chr.1 encode homologous histone methyltransferases.
The early-flowering sdg8 mutant is epistatic to the late-flowering sdg26 mutant.
H3K36me3 levels are decreased similarly in sdg8 sdg26 as in sdg8.
A novel role of SDG26 in H3K36me1 deposition is observed under sdg8 background.