12 Inheritance m the Japanese Convolvulus. Part II 



that it may be seen that the leaf-colour and the "hukurin" are inherited 

 in a simple Mendelian fashion. 



Totals 86 49 135 



From the results oi A xG, C x A, and i? x C it is clear that the 

 genetic constitution of the G parent is ggDDbbmm with respect to the 

 leaf- and flower-colour. Yet if we will speak more strictly there may 

 exist some differences as regards the factor D between B and C, but I did 

 not undertake to study these differences. 



It is quite clear from the above results that G has a factor to produce 

 the "hukurin" on the corolla; moreover that this factor is present in 

 A but not in B has been fully confirmed. 



V. Some facts observed during the experiments. 



1. Relation between the colour of flowers and that of other 

 parts of plant. 



Many observations have already been made by several authors as 

 regards the relation between the colours of flowers and those of other 

 parts of plant. The phenomenon most commonly known is that where 

 positive relations exist between them. Gregory^ observed in Primula 

 sinensis that anthocyanin may be entirely absent when the stem is green 

 and that pale flower-colour is associated with faint colour in young leaves 

 as well as green or faintly coloured stem ; besides, he has discovered the 

 following associations : deep flower-colour and deep stem-colour, true 

 red flower-colour and true red stem, blue flower-colour and blue stem. 

 Nohara^ observed in his study of inheritance on Oxalis corniculata that 

 the purple colour in the eye of the corolla and in the leaf are associated 

 to each other, but the leaf-purple can appear without being associated 

 with the eye purple. I^ have reported in the garden varieties of Rhodo- 

 dendron ohtusum, Rh. ledifolium var. purpureum, and Rh. indicuni var. 

 macranthum which are cultivated in Japan, that the more intense the 



1 Journal of Genetics, 1911, Vol. i. pp. 73—132. 



- Journal of College of Agriculture, Tokyo, 1915, Vol. vi. pp. 165 — 181. 



'^ Journal of the Scientific Agricultural Society, Tdkyo, 1914, No. 145, pp. 1 — 6. 



