BSeq: Bisulfite sequencing;

CMT: CHROMOMETHYLASE;

CTAB: cetyltrimethylammonium bromide;

DEGs: differential expression genes;

DMR: differential methylation region;

DNMT1: DNA methyltransferase 1;

DRM: DOMAINS REARRANGED METHYLTRANSFERASE;

FPKM: fragments per kilo base of transcript per million base pairs sequenced;

GO: gene ontology;

H3K9: histone H3 lysine 9;

KEGG: kyoto encyclopedia of genes and genomes;

mCs: methylcytosines;

MET1: methyltransferase 1;

P: petal;

PUB33: Plant U-box 33;

qRT-PCR: quantitative real time PCR;

RdDM: RNA-directed DNA methylation;

SAM: shoot apical meristem;

SAUR: small auxin up-regulated RNAs;

siRNAs: short-interfering RNAs;

Sp: petaloid stamen;

St: stamen;

TSSs: transcription starting sites;

WGBS: whole genome bisulfite sequencing.