G. P. HECTOR 



93 



Another case of red colour giving the 3 : 1 ratio afiected the apiculus 

 of the glumes only. A hybrid parent with red apiculus to the glumes but no 

 apparent colour elsewhere selected in 1912, gave in 1913, 75 plants with red 

 apiculus : 25 with no apiculus. 



The above cases are all from natural crosses. In 1913 several artificial 

 crosses were made between a whollv green variety (Pookhi, Plate I, figs. 5-8) 

 and a variety with marked reddish colour in the leaf-sheath and glume-apex, 

 and a purple colour in the stigma (Pankhiraj, Plate I, figs. 1-4). The F^ 

 plants (1914) showed the colour characters almost wholly dominant. 



In 1915 the following results were obtained with reference to colour 

 characters : — 



Here, again, the colour in the leaf-sheath, apiculus and stigma behaves 

 as a single unit and may be due to one simple factor ; or it is necessary to 

 suppose that the green parent possessed one of the factors necessary for the 

 production" of colour, but was lacking in the other, i.e., that the cross is of 

 the nature RC x rC or Re. 



(3) Purple colour in the stigma due to three interacting factors. 



It has been noted above that in some of our types with colour in the 

 leaf-sheath, apiculus and stigma, the colour in the leaf-sheath and apiculus 

 is some shade of red, while that in the stigma is a deeper purple. Graham^ 

 states with reference to the coloured varieties in the Central Provinces that 

 where the stigma is coloured, the colour of the stigma corresponds with the 

 colour in the leaf-sheaths ; th so with red leaf-sheath having a red stigma, 

 those with bluish or purplish leaf-sheath having a blue or purple stigma. 



' Graham, he cit. 



