94 



THE INHERITANCE OF CHAEACTERS IN RICE 



The same set of characters appeared in No. 640, another cross with B, 23 

 but by an unknown male parent. Fi was in appearance the same as the cross 

 already described and its constitution proved to be the same, except that it 

 was heterozygous for one of the pigmentation factors. Thus in Fo pigmented 

 and unpigmenfed plants appeared in the ratio of 3:1. This did not affect the 

 composition of the pigmented group, which was made up of the three groups 

 already described — LGsa, LGSA and 1 g S A — in the 1 : Q : 1 ratio. 

 Here, again, in F3 the same result was obtained. Six plants of the L Gr S A 

 group all reproduced the 1:2:1 ratio, whereas six from each of the other 

 groups all bred true {see Table XIII). No aberrant types were produced in 

 this group. 



Table XIII. 



Parents 



F,. B, 23X ? .. 

 No. G-iO, F., 



Total 



Calculated 1:2:1 



Reference No. 



LGsa 



f)40 



r 6 plants, N, 

 [ LGSA 



f 6 plants j 



LGsa j 



6 plants "\ 



IgSA 



47 



(31 



778 



LGSA 



96 

 1,702 

 1,798 



IsSA 



68 

 S79 

 947 



8S!0'75 : 1761 -5 : SSO'75 



2.824 



4,014 



N.B. — Unpigmcnted groups, occurring in certain of the above families, have been 

 disregarded. 



The above results are quite definite in showing repulsion between p^trple 

 lining and glumes coupled on the one hand and purple stigma and axil coupled, 

 on the other. The exact nature of the repulsion, however, is not evident ; 

 thus either L, or G, or the L G combination, may repel either S, or A, or the 

 S A combination. Some light is thrown on this point by another group of 

 families arising from a naturally occurring heterozygote. This plant, No. 153, 

 was a rogue with purple-lined intern ode and purple glumes in a variety, Dahva, 

 with green iiiternode and glumes. Fo was not counted but it was noted that 

 segregation was taking place for purple lining and glumes, wliicli, were coupled, 

 and that purple axil was pure. The stigma w^as not examined but from the 



