The data contains a total of seven files: Fig.1 Flowering time and leaf number; Fig.3 Relative expression levels of the six genes; Fig.4 relative expression levels of the downstream genes; Fig.5a Flowering time of 27 A. thaliana accessions treated with 5-azac; Fig.5b Number of mehtylation sites after 5-azaC treatment; Fig.5c gene expression levels among accessions treated with 5-azac; Fig.6 leaf number and flowering time of transgenic plants; Fig.7 .Relative expression level of transgenic plants. The data acquisition method can be found in the Method of the article.