A GENETICOPH Y SIOLOGIC AL STUDY ON THE FORMATION ETC. 
37 
Table 15. 
Ckromogen content of the extract of leaf in Onjza sativa. 
The colour scale was made by the fiavone isolated from the leaf of 
Oryza instead of quercetin. 
Colour scale 
Frequency of varieties with respect to the colour of 
awn and apex of the paleas. 
Faint yellow 
Brown 
Red 
Purple 
Total 
Ill 
1 
1 
IV 
3 
1 
1 
5 
V 
40 
8 
20 
15 
83 
VI 
18 
12 
3 
1 
34 
Below VI 
1 
1 
63 
21 
23 
17 
124 
According to the spectrographic investigation of Y. Shibata and Kimo- 
tsuki (1918) 1 , the absorption spectra of the flavone isolated from the leaf of 
Oryza sativa conformed to these of pure luteolin. 
(b) The Cross : Brown x Faint Yellow. 
The breeding experiments made by the different investigators in Japan, 
have already shown that the hybrid between certain varieties having the 
brown awn and the faint yellow, gave in F[, the red awned plant. The red 
colour is due to anthocyanin. The segregation in F, takes place by the ratio 
9 reds, 3 browns and 4 faint yellows, otherwise the ratio is more complicated. 2 
The phenomena are in accord with the well known cases of the flower in 
Lathyrus in which the colourless types produce the coloured one in F i . The 
writer obtained the similar results by the following crosses. 
“ Daikkoto ” x “ Togo ” 
“ Kura-fusagi ” x “ Nagoya-shiro ” 
The characters studied in the above crosses are the following : 
1. Shibata, Y. and Kimot.wiu, K, Spectro-analysis of the Plant Pigments of Flavone Group. 
I. Jour. Chem. Soc., Tokyo. 39.771, 1918. (In Japanese) 
2. Some of the results obtained by Dr. Kato are briefly summerized in Ikeno, S., Zikken- 
Idengaku. p. 84, 1918. Also in Botanical Abst. 2 : 114, Entry 679, 1919. 
