In the Arabidopsis Thaliana, LEAFY (LFY) is a master regulator promoting floral fate (meristem cells into flower) and floral organ identity. It has two functional domains: the Helix turn helix (HTH) DNA binding domain, and the SAM (Sterile Alpha Motif) domain. LFY’s DNA-binding affinity relies greatly on SAM’s role in facilitating higher-order oligomerization. In our prediction analysis, the K80 residue of LFY is predicted as a potential putative target for SUMOylation post-translational modification (PTM). The genetic analysis of a mutation in SAM shows a dominant gain of function of LFY, causing floral organ abnormalities - no petals, increased stamen numbers, abnormal and in this case ectopic carpels. We speculate this may be due to the ectopic gain of function of LFY target AGAMOUS (AG), a C-class homeotic TF in the ABC model. Further, the overexpression mutant analysis also supports enhanced expression of AG. I will be presenting preliminary data supporting the significance of LFY SUMOylation as a post-translational modification crucial for LFY function.