A BRACHYTIC VARIATION" IN MAIZE. 



15 



ing the 3 to 1 monohybrid ratio. The actual number was 234 nor- 

 mal and 74 brachytic, the percentage of the recessive class being 

 24.0 ± 1.7. The measurements of these second-generation plants 

 also are given in Table III. 



Table III. — Measurements of maize plants of the first and second generations 

 of the brachytic X Boone hybrid. 



[The ears had dark and pale colored seeds, and the number 11 following the progeny designation indicates 

 that the color of the seed planted was dilute. Figures in the last two columns in black-face type 

 indicate the characters in which the brachytic plants exceeded the plants of normal stature.] 



Character. 



Height of plant, 



decimeters 



Height of upper ear from 



the ground. decimeters. 



Length of branching 



space centimeters. . 



Length of central spike, 



centimeters 



Length of longest tassel 

 branch. . .centimeters. . 

 Number of tassel branches. 

 Longest leaf: 



Length. centimeters. . 



Width do.... 



Length of longest inter- 

 node centimeters. . 



Number of internodes 



above longest 



Diameter of stalk, -jV inch . 



Number of ears 



Ear length: 



Upper ear, centi- 

 meters 



Total . . . centimeters. . 

 Number of rows on upper 



ear 



Length of staminate 

 spike on upper ear, 



centimeters 



Number of leaves: 



Above the upper ear. 



Total 



Number of nodes: 



With roots 



Without roots 



Length of longest leaf 



sheath centimeters. . 



Number of leaf sheaths 



above longest 



Length of upper ear 

 stalk centimeters. . 



First generation. 



Dh 435. 



Dh 435- 

 11. 



27.2±0.25 26. 



13.0±0.2512. 



19.5±0.2719. 



32. 0±0. 67,30. 



29.1±0.50!27. 

 37. 8± 1.24134. 



103.5±0.57.91. 

 9.9±0.15 9. 



16.8±0.34 18.2±0.13 



8±0.3G 



4±0.28 



0±0.37 



0±0.50 



0±0.46 

 Oil. 21 



5±1.24 

 1±0.15 



9.9±0.29 7. 

 16. 9±0. 29:13. 



7±0.1S 

 8±0.39 



23.2±0.53 21.4±0.55 

 26.8±1.25 22.2±0.54 



18.2±0.1116.6±0.24 



5.7±0.09 

 22. 3 ±0.20 



7.5±0.14 

 14. 7 ±0.25 



23.6±0.29 



Dh 436. 



26 

 12 

 18 

 30. 7± 0.61 



Dh 430- 

 11. 



0±0.22 20. 

 3±0.1911. 

 2±0. 34,17. 



7±0.51 

 3±1.33 



.5±0.87 

 ■ 7±0.12 



17.8±0.29 



4±0.21 

 1±0.18 



5.2±0.08 

 20.3±0.25 



14.4±0.22 

 22.6±0.25 



13.0±0.2712.4±0.42 

 12.7±0.4610.2±0.56 



18.8±0.41 

 22. 2 ±0.90 



17. 7±0. 11 



5.0±0.06 

 21.0±0.21 



14.1 ±0.14 

 20. 9± 0.20 

 12.0±0.27 

 9.6±0.40 



32. 



85. 



1±0.37 

 7±0.26 

 1±0.54 



7±0.71 



2±0.40 

 2±1.34 



8±1.28 

 9±0. 12 



17.5±0.16 



3±0.15 

 1±0.31 



20. 2± 0.38 

 24.3±0.94 



16.2±0.11 



5.0±0.08 

 21.9±0.75 



Second generation. 



Normal. 



29.7±0. 



12.0±0. 



15. 1±0. 



30.0±0. 



24.3±0. 

 31.7±0. 



95.2±0. 

 8.9±0. 



16. 8± 0.12 



7.5±0. 

 14.2±0. 

 1.25±0. 



16.2±0.20 

 20. 7 ±0.40 



18.2±0.12 



5.5±0.30 



4.9±0.03 

 21.7±0.09 



7.3±0.07 



13.6±0. 17 

 20.0±0.43 22.7±0.13 

 U.4±0.24 11.3±0.09 

 9.5±0.70 8.7±0.23 



Bra- 

 chytic. 



4±0.12 



9±0.06 



2±0.22 



7±0.56 



4±0.29 

 4±0.72 



2±0.62 

 9±0.07 



5.4±0.12 



1±0. 18 

 0±0.23 

 5±0.05 



14.0±0.21 

 20. 6± 0.57 



17.0±0.13 



4.8±0.46 



4.8±0.04 

 22. 3 ±0.12 



8.5±0.05 



22.4±0.19 

 11.0±0.14 

 7.4±0.23 



Differ- 

 ence. 



19.3±0.17 

 8.1±0.13 

 2.9±0.2 

 0.7±0.63 



0.1±0.48 



4.7±0.77 



5.0±0.75 

 0.0±0.09 



11.4±0.1' 



0.4±0.20 



1.8±0.26 



0.25±0.05 



0.22±0.29 

 0.1±0.7 



1.2±0.17 



0.7±0.55 



0.1±0.05 

 0.6±0.15 



1.2±0.08 



0.3±0.2 

 0.3±0.16 

 1.3±0.31 



Dif- 

 fer- 

 ence 



prob- 

 able 

 error. 



114.0 



62.2 



10.7 



1.1 



.2 



6.7 



6.7 

 



67.0 



2.0 

 6.95 

 4.6 



.76 

 .1 



7.13 



1.3 



2.0 

 4.0 



15.5 



1.5 

 1.8 



4.2 



While no difficulty was encountered in classifying the plants as to 

 stature, a closer examination showed that several plants, classed as 

 normal, in reality had one or more shortened internodes. The actual 

 number was 14 plants with one or two shortened internodes in a 

 population of 130 otherwise normal plants. These brachytic inter- 

 nodes were located either near the base or near the top of the plant. 

 (Pis. IX and X.) Such plants may be heterozygous for the bra- 



