74 I. NAGAI : 



In ceitain varieties of Phaseolvs vulgaris, Tscherjiak ( 1912) showed that 

 the coloured seed coat was dominaut over white, and among coloui'ed types the 

 relation, black > violet > brown was estabhshed. Shull (1508) also found in 

 the same x^lant, purple, brown, yellowish-brown and yellow were dominant 

 over white. He proposed the following genetic composition for the diflerent 

 self coloured types : 



Brown and yellow Pbm 



Black PBm 



White 2^B3I 



in which P is a gene for the pigment, B the modifier of the pigment, and 

 M the mottling gene. P may correspond with CO or C and B witli 7i in 

 our case. 



In dealing with the colour of patterns of the seed coat of figiuz ungnl- 

 culata and Vigna sinensis Spillman (1913) and Haeland (1919) respectively 

 foimd that the solid coloured types were dominaut over the mottled and less 

 coloured ones. The latter author showed als > that Uack was doroinjxnt over 

 brown, and brown over red. The brown was completely dominant over red 

 in Fl and brown, maroon, and red arose in the F-, by the ratio 12 : 3 : 1. 

 These colours are of the phlobaphene nature and no anthocyanin is concerned 

 except black. The genetical behaviour of the phlobaphene colour types in 

 this plant is quite similar to tlia": wliich we have seen in Adzuki and soy 

 Ijeaus. In all these casas the more intense reddish-brown is recessive to less 

 intensely colovu"ed types. 



In Zea 3Iays, East and Hayes (1911)' showed that the dark-red pericai-p 

 was a simple dominant over -white. The coloiu- of the pericarp is due to the 

 pigment belonging to the phlobaphene group. The pm-ple and red aleurone 

 coloura are due to anthocyanins. The formation of the anthocyanin pigment in 

 the aleurone cells is in certain cases, governed by the genes (C. B, P of 

 East and Hayes, C, R, A, Pr. of Emerson) which are apparently similar iu 

 kind as those met iu the case of Lalhijrus, AntirrJdnviu and Onjza. 



1. East. I'. 31. nnl Haye!, H. K., Inheritance in Mixize, Bull. Conn, .\grio. Exp. Station. 

 1C7, 1911. — Emebson, E. a., A Fifth Tair of Factors, .1 '(. for Alerirone Color in Maize, and Its 

 Kolation to the C c and R r Pairs. Cornell University Agrie. Exi). Station Memoir IC, ISilS. 



