172 CORRELATION OF COLOUR CHARACTERS IN RICE 
the exception of the cases referred to, presents no special interest, this 
account is confined to the exceptions. 
1. The first of these was found in the cross Agartollah x (25 already 
described in connection with colour of the vegetative parts. In variety 
Agartollah, the grain is dark red with irregular black marks on the ventral 
edge giving the grain a slightly piebald appearance. On crossing with the 
colourless variety C25 (white grain), the F, islike the Agartollah grain but 
paler in colour, and in F, segregation is into 1 red piebald: 2 pale 
piebald : 1 white. 
Actual figures obtained in three families examined for grain colour are 
given below :— 
Red piebald Pale piebald White 
| 
Le: 141 | 329 149 
as Wes 153 | 360 184 
hale 177 | 342 177 
| 
TOTAL 471 1,031 510 
It is, however, when we consider the relation of the grain colour to the 
colours in the vegetative parts, already described, that most interest attaches 
to this case. 
We have already seen in variety Agartollah that the leaf-sheath, pulvinus 
and auricle, internode, outer glumes and apiculus form a pattern (A), due to 2 
interacting factors and segregating 9: 7 in F,, while the ligule (B) is due to 3 
factors and segregates 27 : 37, together giving, on crossing with the colourless 
(green) type Pookhi— 
36 coloured leaf-sheaths, etc. (A) : 28 green leaf-sheaths (a) 
narra a= a ~ = 
ABC ABe AbC aBC ab Abe aBe abe 
27 9 9 9 3 3 3 1 
a a ee ee eee ee 
27 coloured ligules (B) : f 37 green ligules (b) 
or eee) AD mo vADIS ne Ora B : 28 ab 
When we examine the distribution of the grain colour with reference to 
the above, we find, with a few exceptions, all class AB (coloured leaf-sheath, 
coloured ligule) have coloured grains ; all class Ab (coloured leaf-sheath, 
colourless ligules) have white grains; all class ab (both colourless) have 
coloured and white grains ina ratio of 3: 1, All white grains therefore, with 
