Studies on the flower colours in Rosa, with special refernces to the biochemical and genetic analyses and to the application of those results to the practical breeding. IV

1. The anthocyanins in young leaves of a garden rose “Samba” were isolated and identified by paper chromatographic method. The anthocyanins were cyanidin-3-glucoside, cyanidin-3,5-diglucoside and delphinidin-3,5-diglucoside. The fourth anthocyanin which occureed in very low concentration was inferred to be a pelargonidin-3-bioside, but the definite nature could not be disclosed. 2 The anthocyanin of so-called blue rose was cyanidin-3,5-diglucoside and in spite of the extensive surveys no delphinidin derivative has hitherto been found in rose petal. In the present experiment delphinidin-3,5-diglucoside was identified. The possibility and the limitation to pure blue rose were described.