986 
Journal of Agricultural Research 
Vol. XXIV, Na 12 
EXPERIMENTAL RESULTS 
THE SEED COLOR RATIO 
The inheritance of seed color in wheat has been studied for a number 
of years. Ratios of 3:1, 15:1, and 63:1 of red-seeded and white-seeded 
plants, respectively, have been obtained in the F2 of crosses between red- 
seeded and white-seeded wheats (j, 18, 79, u). Apparently there may 
be from one to three factors for red seed color present in different wheats. 
When one or more of the factors for red are present red seed results. 
The results obtained in the present study are given in Table II. Of 
364 F 2 plants of the Kubanka No. 8 X Pentad cross that were classified, 
295 were red-seeded like the Pentad parent and 69 were white-seeded like 
the Kubanka No. 8 parent. The observ^ed ratio was 3.21:0.79 with red 
seed color dominant. There were 599 F2 plants of the Mindum X Pentad 
crosses classified. The red-seeded totaled 449 and the white-seeded 150, 
the ratio being almost exactly 3: i with red seed color dominant. In 
both cases the presence of a single fa^ctor for seed color is indicated. 
Tabi<E II. —Classification of families on the basis of seed color 
, ? Cross. 
Family num¬ 
bers of F2. 
No. of Fs families. 
Red- 
seeded. 
White- 
seeded. 
Total. 
Kubanka No. 8X Pentad. 
774 to 792 
29s 
69 
364 
Mindum X Pentad. 
793 to 810 
247 
82 
329 
Mindum X Pentad __ .......... 
6.44 to 680 
202 
68 
270 
THE F2 SEED COLOR IN RELATION TO THE RUST REACTION OF THE 
PROGENY 
Tabi^E III .—The relation of seed color to the reaction of the Fg generation of two durum 
crosses to two biologic forms of P. graminis tritici 
Parents of Fa families. 
Reaction of Fs families. 
■ 
Biologic 
form used. 
Classes of infection. 
Cross. 
Seed 
color.' 
Resist¬ 
ant or 
im¬ 
mune 
Near- 
resist¬ 
ant or 
near- 
im¬ 
mune. 
Hetero¬ 
zygous. 
Near- 
sus- 
cept- 
ible. 
Sus¬ 
cept¬ 
ible. 
Total 
num¬ 
ber of 
fami¬ 
lies. 
Kubanka N0.8X Pentad 
Red ... 
XXXIV. 
8 
4 
70 
15 
104 
201 
Do... 
Mindum X Pentad. 
White . 
Red ... 
XXXIV. 
I. 
I 
23 
I 
7 
14 
39 
5 
6 
24 
6 
45 
81 
Do. 
White.. 
I. 
21 
6 
43 
48 
4 
II 
85 
80 
Do. 
Red ... 
XXXIV. 
9 
2 
10 
II 
Do. 
White,, 
XXXIV. 
5 
4 
20 
I 
0 
30 
Table III summarizes separately the results for the Fg families arising 
from red-seeded Fg parents and for those from white-seeded Fg parents. 
The Kubanka 8 X Pentad Fg families reacted with Form XXXIV as fol¬ 
lows : Of those from red-seeded parents, 8 appeared to be resistant, 4 near- 
