Flavonoids of someVigna-plants in leguminosae

Abstract

Flavonoids in five lines ofVigna mungo, fifteen lines ofV. radiata var.radiata and two lines ofV. radiata var.sublobata, which belong to the subgenus Ceratotropis, were examined. In hypocotyls, seed-coats and mature leaves of those plants, twelve kinds of flavonoid including three anthocyanins, two leucoanthocyanins, two glycoflavones and five flavonol glycosides were found, and their distribution pattern in twenty-two lines of the legumes is discussed. The leaves ofV. radiata var.radiata and var.sublobata contained the glycosides (mainly rutin) of both quercetin and kaempferol, while those ofV. mungo contained only kaempferol glycosides, with robinin as the predominant pigment, and the purple-red hypocotyls of the former group contained delphinidin 3-p-coumaroylglucoside, while those of the latter contained cyanidin 3-glucoside, although delphinidin 3-glucoside was commonly found in all of the plants. With the exception of two lines, all of the seed-coats examined contained in common four compounds of vitexin, isovitexin, leucocyanidin and leucodelphinidin, whereas in addition to these pigments the black seed-coats ofV. mungo andV. radiata var.sublobata TC 1965 contained delphindin 3-glucoside.