Nos. 620-621] COLOR IN A VENA CROSSES 



379 



possible to produce a yellow oat from this cross having 

 the type of base of the wild parent. 



Further information may be had regarding pubescence 

 and color on examining the results on three other third 

 generation families which have been grouped according 

 to color and pubescence. The parent plants which pro- 

 duced these three families were black, pubescent on one 

 kernel and nearly awnless. 



These results are shown in Table VII. 



TABLE VII 



showing the Relation between Color and Pubescence from Three 



HI:, 'k 



The segregation shows that no gray was present and 

 that the segregation is only for blacks and yellows so 

 far as color is concerned and follows an approximate 3 : 1 

 ratio. In regard to the pubescence it is clear that all of 

 the black oats are pubescent while all the non-blacks or 

 yellows are smooth. This material further substantiates 

 the statement made earlier in this discussion to the effect 

 that there is a pubescent factor linked with the black oat. 



General Discussion 

 The foregoing data show that there is a very definite 

 relation between color of glume and production of awns. 

 On the black and gray oats awns are produced in varying 

 amounts while few or no awns are produced on the yellow 

 oats. Regarding the inheritance of awns, it has been 

 shown 7 that the weak awn is inherited on a 1:3 ratio, 

 the fully awned condition being recessive. The data 



