A method for base editing in plants

A system for performing base editing to a target sequence in a plant genome, comprising at least one of the following (i) to (v):

• i) a base editing fusion protein, and a guide RNA;
• ii) an expression construct comprising a nucleotide sequence encoding a base editing fusion protein, and a guide RNA;
• iii) a base editing fusion protein, and an expression construct comprising a nucleotide sequence encoding a guide RNA;
• iv) an expression construct comprising a nucleotide sequence encoding a base editing fusion protein, and an expression construct comprising a nucleotide sequence encoding a guide RNA;
• v) an expression construct comprising a nucleotide sequence encoding base editing fusion protein and a nucleotide sequence encoding guide RNA;
• wherein said base editing fusion protein contains a nuclease-inactivated Cas9 domain and a deaminase domain, said guide RNA can target said base editing fusion protein to the target sequence in the plant genome.