A Genetico-Physiological Study on the Formation 



of Anthocyanin and Brown 



Pigments in Plants. 



By 



Isaburo Nagai. 



Impeiial AgrictUturnl Exj^riment Station, Jaiinn. 



AMtli Plate I aud t^o Text-fisnues. 



CONTEXTS 



lutroJuction. 

 t . rhysiologiail Study. 



1. The Action of Oxiilizing Enzymes on Anthocyanins. 



2. The Action of Oxidizing Enzymes on Flavones, 



3. Flavone Derivatives as Chromogenic SubstancM of Reddish Brown Plant Pigments 



(Phlobaphenes). 



4. Eole of Oxygen in the Formation of the Chromogenic Substance and Anthocyanin. 



5. A Group of Substances of Unknow-n Chemical Nature As the Chromogcn of Anthocy- 



anins and Keddish Brown Pigments. 

 II. Genetical Study. 



1. The Mode of Inheritance of Anthocyanin and Brown Pigment in the Awn and Other 



Parts of Oryza sativa. 



(a) Colour Types of the Awn. 



(b) The Cross: Brown x Faint Yellow. 



(c) The Cross : Ked x Purple. 



(d) The Eelation Between the Colour of the Grain and the Paleas. 



2. The Mode of Inheritance of Anthocyanin and Brown Pigment in the Seed Coat of 



Glycine sojii. 



(a) Colour Types of the Seed Coat. 



(b) The Cross: Blue Tinged Yellow x Brown and the Reciprocal. 



(c) The Cross: Buff x Black. 



[Jotir. CoU. Agric, Vol. Vm, Ko. 1, 1921.] 



