34 Journal of Agricultural Research v 0 i. xxx, no. i 
Table IV. — Data on inheritance of three different methods of floret disjunction in 
the progeny of selected kernels of each of eight strains of the Burt oat when grown 
at the Akron Field Station in 1921 
Kernels in progeny 
Strain number and method of disjunc¬ 
tion in parent kernels 
Number disjoining 
i by- 
Percentage disjoining 
by— 
' 
Basi- 
1 fracture 
Hetero- 
fracture 
Disartic¬ 
ulation 
Basi¬ 
fracture 
Hetero¬ 
fracture 
! Disartic¬ 
ulation 
Kansas No. 5020: 
Basifracture_ _ 
3 
7 
21 
9.7 
22.6 
j 
67. 7 
Heterofracture.- _ 
10 
96 
84 
5.3 
50. 5 
44.2 
Disarticulation_ 
! 33 
169 
629 
4.0 
20.3 
75.7 
Kansas No. 5211: 
f 
Basifracture.._ 
! 84 
162 
181 
19.7 
37.9 
42.4 
Heterofracture__ 
151 
408 
442 
15.1 
40.7 
44.2. 
Disarticulation__ 
92 
469 
1,162 
5.3 
27.2 
67.5 
Kansas No. 5220: 
Basifracture_ _ 
2 
9 
34 
4.4 
20.0 
75. a 
Heterofracture_ 
j 6 
28 
70 
5.8 
26.9 
67. 3 
Disarticulation_ 
15 
40 
362 
3.6 
9.6 
86.8 
Kansas No. 6004: 
Disarticulation.__ 
1 
2 
26 
3.4 
6.9 
89. 7 
Kansas No. 6052: 
Heterofracture_ 
0 
0 
7 
0 
0 
100.0. 
Disarticulation_ ... 
6 
28 
279 
1.8 
8. 5 
89. 7 
Kansas No. 6076: 
Basifracture_ 
5 
28 
16 
10.2 
57.1 
32. 7 
Heterofracture_ 
0 
20 
5 
0 
80.0 
20.0 
Disarticulation_ _ ... 
30 
124 
309 
6.5 
26.8 
66. 7 
Kansas No. 6090: 
Heterofracture -_ 
43 
300 
221 
7.6 
53.2 
39.2 
Disarticulation_ 
4 
26 
142 
2.3 
15.1 
82.6 
Kansas No. 6094: 
Basifracture_ 
2 
34 
49 
2.4 
40.0 
57. 6 
Heterofracture_ 
8 
64 
57 
6.2 
49.6 
44.2 
Disarticulation_ 
9 
79 
206 
3.1 
26.9 
70.0 
All strains: 
Basifracture_ 
96 
240 
301 
15.1 
37. 7 
47.2. 
Heterofracture_ 
218 
916 
886 
10.8 
45.3 : 
43.9 
Disarticulation _ _ 
190 
937 
3,133 
4.5 
22.0 1 
i 
73.5 
The results of the 1921 experiments 
on the inheritance of floret disjunction 
indicate the correctness of the con¬ 
clusions drawn in 1920 and confirm 
the statement that floret disjunction by 
basifracture as observed in these Burt 
oat strains is very much less stable in 
breeding behavior than is that by dis¬ 
articulation. 
A review of the data on floret dis¬ 
junction obtained in these experi¬ 
ments indicates that the disjunction 
resulting from disarticulation is the 
more stable in breeding behavior. 
The results for the two years were 
similar in this respect. The results 
obtained by Fraser (37), in his cross 
of Burt ( sterilis type) X Sixty-Day 
(sativa type) indicated that the sativa 
type of floret disjunction by disarticu¬ 
lation is dominant over the sterilis 
type which results from basifracture 
and that a single factor difference 
governs the inheritance of floret dis¬ 
junction. 
The data presented on the inheri¬ 
tance of the floret disjunction in the 
Burt oat indicates that, to explain the 
breeding behavior of this character in 
this variety on a factorial basis, it will 
be necessary to conduct carefully con¬ 
trolled hybridization experiments using 
parental material of which the breeding 
behavior for this character is definitely 
known. 
BASAL HAIRS 
In classifying the material from the 
nine strains of Burt oat used, three 
quantity classes for basal hairs were 
recognized, namely, abundant, few, and 
absent. In describing the progeny 
kernels of the 1920 crop a subdivision 
of the first class seemed necessary 
to allow separation of long and mid¬ 
length hairs. As the kernels grown in 
1919 and sown in the 1920 experiments 
were machine threshed, many of the 
basal hairs were rubbed off "and for 
that reason classification of the original 
material was subject to error. In 
some cases kernels which had borne 
hairs probably lost all or many of 
them in threshing and an erroneous 
description resulted. 
