212 Albinism in Maize 



Fig. 9 shows a portiou of a white stripe and also a portion of a 

 green stripe in a variegated leaf of maize. It is not at all difficult to 

 note the boundary between the white and the green portion.s, for well- 

 differentiated plastids are present in the green portion and are ab.sent 

 in the white portion. 



Fig. 9. Cross section through a striped green and 

 white leaf. The boundary between the green and 

 the white stripes is distinct, as is shown by the 

 absence of plastids in the white portion, x 380. 



Summary. 



From the studies of the various categories it appears that in all 

 cases, with the possible e.xception of the striped leaves in Zea japonica, 

 the several degrees of albinism in corn leaves behave as simple 

 Mendelian recessives; the first generation of a cross with ordinary 

 green races giving fully green plants, and the second generation 

 segi'egating in the ratio of three green plants to one plant of the 

 particular type which was used in the cross. 



The study of the manner of inheritance of variegated leaves of 

 Zea japonica in crosses where aleurone colour is involved has not 

 been completed. 



A rather definite relation has been pointed out between a pure 

 white type -of maize plant and a yellowish-white type, the results 

 indicating that the presence of at least two factors is necessary for 

 the development of normal green in the leaves of maize. In the 



