324 SCIENTIFIC AGRICULTURE June, 1922 



Table VII. — -Inheritance of Chaff Colour in the Cross Commonwealth x Kitchener 



Dark red 

 Light red 

 White . . 



12 

 18 

 10 



1 .20 

 1.80 

 1 .00 



with dark-red chaff, and Kitchener, a Can- 

 adian variety with white chaff. The data, 

 as shown in Table VII, distinctly brings out 

 the dominance of red glume colour over the 

 absence of colour. Of 40 individual plants, 

 12 had dark red chaff, 18 light red, and 10 

 white, a very good 1:2:1 ratio. 



Summary 



1. The number of factors for seed colour 

 was found to vary with the different 

 varieties and with different strains of the 

 same variety. Segregation for seed colour 

 occurred in both 3:1 and 15:1 ratios, red 

 being dominant to white. Kitchener has two 

 factors for .seed colour but Hard Red Cal- 

 cutta and Red Bobs have one in some se- 

 lected lines and two in others. 



2. Seed texture appeared to be governed 

 by several factors. The distribution in Fo 

 approximated the extreme range of the 

 parent varieties. 



S. Two factors appeared to be concerned 

 witli the production of fully awned spikes. 

 In the ¥.. of a cross between Hard Red Cal- 

 cutta, a bearded variety, and White Bobs, a 

 bald variety, four homozygous forms re- 

 sulted, two having the parental combinations 

 BBTT and bbtt, and two, represented by 

 BBtt and hbTT, being tip-awned. In addi- 

 tion there were several heterozygous forms 

 intermediate between the })arent sorts; those 

 witli one factor heterozygous, represented 

 by BBTt and BbTT giving long tip-awns, 

 and by Bbtt and bbTt giving short tip awns ; 

 those with two factors heterozygous, of the 

 constitution BbTt, with fairly short tip awns. 

 Tlie material studied was jjlaced in five 

 groups, bald, almost bald, short tip-awned, 

 h)ng ti])-awned, and bearded. Tl)e factors 

 found to be present in the varieties used may 

 be designated as follows: 

 Hard Red Calcutta .... BBTT 



Tavlor's Wonder BBtt or bbTT 



White Bobs bbtt 



0.20 

 0.20 

 0.00 



:0.19 

 ;0.21 

 :e.l9 



4. A single factor was responsible for red 

 colour of chaff in the cross studied. Segre- 

 gation occurred in a 1:2:1 ratio of dark red, 

 light red and white. 



Literature Cited 



1. — Biffin, R. H.. 1905. Mendel's law 

 of inheritance and wheat breeding. 

 Jour. Agr. Sci. 1 : 4-48. 



2. — 1916. The suppression of characters 

 on crossing. Jour. Genetics 5: 225-228. 



3. — Babcock, E. B. and Clausen, R. S. 

 1918. Genetics in relation to agriculture, 

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4. — Freeman, G. F. 1918. Producing 

 breadmaking-wheats for warm climates. 

 Jour. Heredity 9: 211-226. 



5. — Gaines, E. F. 1917. Inheritance in 

 wheat, barley and oat hybrids. Wash- 

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6. — Hayes, H. K. 1918. Natural crossing 

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7. — Hayes, H. K. and Garber, R. J. 

 1921. Breeding crop plants, pp. 35-36, 



77-88. 



8. — Howard, A. and Howard. G. L. C. 

 1912. On the inheritance of some characters 

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9. — 1915. On the inheritance of some 

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10.^ — Kezer, Alvin and Boya^-k. Brteze. 

 1918. Mendelian inlicritance in wlieat 

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 157. 



