Has no flavonol 3-O-glucoside (1->6) rhamnosyltransferase activity in vitro. Expressed in young leaves, flowers, pods and pod shells. Barely detected in seeds, roots and root nodules. Flavonol glycosides (FGs) having rhamnose at the 6''-position of glucose or galactose that is bound to the 3-position of kaempferol are present in cv. Koganejiro, whereas FGs of cv. Kitakomachi are devoid of rhamnose. In contrast to cv. Koganejiro, FG2 of cv. Kitakomachi has a two-base deletion that generates a truncated polypeptide devoid of enzymatic activity.