Jan. 1, 1925 
A Study of Variability in the Burt Oat 
51 
Table XII.— Data on association of spikelet disarticulation and basal hairs in 9 
strains of Burt oat grown at the Kansas Agricultural Experiment Station in 
1920 
Basal hairs 
disarticulation in kernels 
Abundant 
Long 
, Mid¬ 
length 
Kansas No. 5020: 
Abscission__ _ 
0 
m 
Semiabscission_ . 
0 
18 
Fracture_ _ _ 
0 
o 
Kansas No. 5211: 
Abscission _ _ 
60 
247 
Semiabscission _ 
0 
25 
Fracture...... 
0 
0 
Kansas No. 5219: 
Abscission___ ... 
27 
122 
Semiabscission.. 
2 
78 
Fracture_ . .. 
0 
0 
Kansas No. 5220: 
Abscission.. 
0 
18 
Semiabscission... 
0 
14 
Fracture_ _ . _ 
0 
0 
Kansas No. 6004: 
Semiabscission__ 
0 
0 
Fracture.. 
0 
0 
Kansas No. 6052: 
Semiabscission__ 
0 
J 
0 
Fracture..... 
0 
0 
Kansas No. 6076: 
Semiabscission__ 
0 
0 
Fracture___ 
0 
0 
Kansas No. 6090: 
Abscission..__ . .. 
0 
108 
Semiabscission... 
0 
23 
Fracture.. 
0 
0 
Kansas No. 6094: 
Abscission _ 
0 
117 
Semiabscission__ 
0 
2 
Fracture__ 
0 
3 
All strains: 
Abscission. _ _ 
87 
723 
Semiabscission... 
2 
160 
Fracture_ ... 
0 
3 
Number of kernels having 
hairs— 
Percentage of kernels having 
hairs— 
Few 
Absent 
Abundant 
I-S i length 
Few 
Absent 
95 
3 
0 
i 
j 
! 53.1 
45.5 
1.4 
336 
42 
0 
j 4.5 
84.9 
10.6 
282 
756 
0 
j 0 
27.2 
72.8 
481 
11 
7.5 
30.9 
60.2 
1.4 
361 
46 
0 
! 5.8 
83.6 
10.6 
154 
674 
0 
1 ° 
18.6 
81.4 
537 
51 
3.6 
16.6 
72.9 
6.9 
612 
76 
.3 
10.1 
79.7 
9.9. 
63 
336 
0 
0 
15.8 
84.2 
80 
3 
' 0 
17.8 
79.2 
3.0 
93 
62 
0 
8.3 
55.0 
36.7 
153 
456 
0 
0 
25.1 
74.9 
17 
1 
0 
0 
94.4 
5.6 
348 
571 
0 
0 
37.9 
62.1 
16 
5 
0 
0 
76.2 
23.8 
286 
1,114 
0 
0 
20.4 
79.6 
39 
51 
0 
0 
43.3 
56.7 
370 
535 
0 
0 
40.9 
59.1 
219 
20 
0 
31.1 
63.1 
5.8 
252 
132 
0 
5.7 
61.9 
32.4 
94 
513 
0 
0 
15.5 
84.5 
60 
1 
0 
65.7 
33.7 
0.6 
184 
85 
0 
. 7 
67.9 
31.4 
102 
329 
0 
.7 
23.5 
75.8 
1,472 
89 
3.7 
30.5 
62.1 
3.7 
1,910 
500 
. 1 
6.2 
74.3 
19.4 
1,852 
5,284 
0 
.1 
25.9 
74.0 
Q=0.909±0.001 
The data presented in Table XII 
for each of the nine strains show that 
the correlation existing between spike- 
let disarticulation by abscission and 
abundant midlength basal hairs varies 
in the different strains. In Kansas 
Nos. 5020 and 6094, 53.1 and 65.7 per 
cent, respectively, of the kernels having 
this disjunction method also had 
abundant midlength basal hairs. In 
the other four strains in which kernels 
having this disjunction method were 
observed there also was correlation 
between these two characters but it 
was not so high. 
Kernels in which spikelet disjunction 
was by semiabscission generally were 
found to have few basal hairs. The 
correlation between these two char¬ 
acters varied slightly in different 
strains but was very pronounced in 
every strain grown. In only one strain, 
Kansas No. 6076, did less than 50 per 
cent of the kernels disarticulating by 
semiabscission have few basal hairs. 
These correlations might be taken as 
clearly indicating the heterozygous con¬ 
dition of the kernels in either of these 
classes. 
The data for the different strains 
show conclusively that there is corre¬ 
lation between spikelet disarticulation 
by fracture and the absence of basal 
hairs. In seven of the nine strains more 
than 70 per cent of the kernels dis¬ 
articulating by fracture had no basal 
hairs. In some strains these two condi¬ 
tions were associated in more than 80 
per cent of the kernels. 
Only 3.7 per cent of the kernels 
disarticulating by abscission were with¬ 
out basal hairs. Less than 0.1 per cent 
