S-adenosyl-L-methionine-dependent methyltransferase that catalyzes the 4'-methylation of naringenin (4',5,7-trihydroxyflavanone) into ponciretin (4'-methoxy-5,7-dihydroxyflavanone). In vitro, also able to convert apigenin, daidzein, genistein and quercetin into the 4'-O-methylated compounds acacetin, formononetin, biochanine A and 4'-methylated quercetin, respectively. a 4'-hydroxyflavanone + S-adenosyl-L-methionine = a 4'-methoxyflavanone + H(+) + S-adenosyl-L-homocysteine Belongs to the class I-like SAM-binding methyltransferase superfamily. Cation-independent O-methyltransferase family. COMT subfamily.