A Study of Variability in the Burt Oat 
53 
Jan. 1, 192'» 
From the data presented in Table 
XIII it does not appear; that spikelet 
disarticulation by semiabscission is 
;strongly correlated with any one 
kind of awn, although more often 
kernels disarticulating by semi¬ 
abscission have nontwisted long or 
short awns than twisted awns or awns 
absent. In every strain there is a 
marked tendency for the nontwisted 
long awns and disarticulation by abs¬ 
cission to be associated, while a com¬ 
paratively high percentage of the 
kernels disarticulating by fracture had 
awns absent. The twisted awn does 
not appear to be associated with any 
spikelet disarticulation method, al¬ 
though there seems to be some evidence 
of lack of association between the 
twisted awn and abscission. This, 
together with the data on inheritance 
of awns in other portions of this paper, 
indicates that the twisted awn is 
possibly genetically distinct from the 
other awn types in the strains of Burt 
oat used in these experiments. 
Table XIV. — Data on association of lemma color and spikelet disarticulation in 9 
strains of Burt oat grown at the Kansas Agricultural Experiment Station in 1920 
Spikelet disarticulation 
j Number of kernels disarticu- Percentage of kernels dis- 
Strain number and lemma color in kernels j lating by— | articulating by— 
1 
] 
! 
Abscis¬ 
sion 
Semiab¬ 
scission 
Fracture 
Abscis¬ 
sion 
Semiab¬ 
scission 
Fracture 
j 
Kansas No. 5020: 
Black_ 
0 
24 
3 
0 
88.9 
11.1 
Brown_ 
162 
327 
505 
16.3 
32.9 
50.8 
Red_ 
38 
45 
461 
7.0 
8.3 
84.7 
Yellow_ 
9 
0 
63 
12.5 
0 
87.5 
White___ 
0 
0 
6 
0 
0 
100.0 
Kansas No. 5211: 
• 
Black..__ 
17 
4 
29 
34.0 
' 8.0 
58.0 
Brown___ 
418 
178 
358 
43.8 
18.7 
37.5 
Red____ 
362 
237 
315 
39.6 
25.9 
34.5 
Yellow_ 
2 
13 
126 
. 1.4 
9.2 
89.4 
Kansas No. 5219: 
Black.-_ r -- 
4 
32 
4 
10.0 
80.0 
10.0 
Brown___ 
444 
552 
254 
35.5 
44.2 
20.3 
Red__ 
239 
171 
141 
43.4 
31.0 
25.6 
Yellow_ 
50 
13 
0 
79.4 
20.6 
0 
Kansas No. 5220: 
Black..... 
0 
7 
6 
0 
53.8 
46.2 
Brown.... 
18 
101 
200 
5.6 
31.7 
62.7 
Red__ 
83 
48 
280 
20.2 
11.7 
68.1 
Yellow_ 
0 
13 
118 
0 
9.9 
90.1 
White___ 
0 
0 
5 
0 
0 
100.0 
Kansas No. 6004: 
Brown___ 
0 
17 
231 
0 
6.9 
93.1 
Red.__ 
0 
1 
582 
0 
.2 
99.8 
Yellow^___ 
0 
0 
106 
0 
0 
100.0 
Kansas No. 6052: 
Brown_ _ 
0 
19 
369 
0 
4.9 
95.1 
Red_ 
0 
2 
603 
0 
0.3 
99.7 
Yellow_A._ 
0 
0 
412 
0 
0 
100.0 
White_ 
0 
0 
i 16 
0 
0 
100.0 
Kansas No, 6076: 
Black.__ 
0 
0 
11 
0 
0 
100.0 
Brown___ 
0 
52 
i 141 
0 
26.9 
73.1 
Red___ 
0 
27 
i 286 
0 
8.6 
91.4 
Yellow___ 
0 
11 
467 
0 
2.3 
97.7 
Kansas No. 6090: 
Black___ 
16 
13 
6 
45.7 
37.1 
17.2 
Brown__ ___ 
299 
355 
533 
25.2 
29.9 
44.9 
Red____ 
32 
39 
57 
25.0 
30.5 
44.5 
Yellow___ 
0 
0 
11 
0 
0 
100.0 
Kansas No. 6094: 
Black_ 
2 
0 
0 
100.0 
0 
0 
Brown___ 
58 
139 
142 
17.1 
41.0 
i 41.9 
Red_ __ 
89 
92 
144 
27.4 
28.3 
I 44.3 
Yellow__ 
29 
40 
143 
13.7 
18.9 
! 67.4 
White...... 
0 
0 
5 
0 
0 
; ioo.o 
All strains: 
1 
i - 
Black___ 
39 
80 
59 
21.0 
47.3 
i 31.7 
Brown--- 
1,399 
1,740 
2, 733 
23.8 
29.6 
I 46.6 
Red_ 
843 
662 
2,869 
19.3 
15.1 
! 65.6 
Yellow.... 
90 
90 
1,446 
5.5 
5.5 
I 89.0 
White___ 
0 
0 
32 
0 
0 
100.0 
Q=0.501±0.005. 
