3i6 
Journal of Agricultural Research 
Vol. XXV, No. 7 
In an unrelated hybrid between Esperanza and liguleless, the combi¬ 
nation of pistillate ear and dwarf stature was obtained. The fourfold 
distribution in this hybrid is: 
Normal stature, 
pistillate ears. 
Normal stature, 
perfect flowered 
ears. 
Dwarf stature, 
pistillate ears. 
Dwarf stature, 
perfect flowered 
ears. 
210 
IO 
4 
48 
The percentage of perfect flowered ears is 21.3 ±1.67 and the per¬ 
centage of dwarf plants is i9.i±i.6, while Q = 0.992±0.004, indicating 
about 5 per cent of crossing over. 
LIGULELESS LEAVES 
The percentage of plants with liguleless leaves in the entire population 
was 25.8 ±o. 97, while the percentage in the normal group was 27.o± 1.27, 
in the brachytic 27.9±2.3, and in the dwarf 2o.3± 1.94. Since the per¬ 
centage for the entire population closely approximates the expected, the 
low percentage of liguleless plants in the dwarf group can not be charged 
to a low survival value of the dwarf-liguleless combination. There is 
little evidence, however, of a linkage, since Q = 0.2 ±0.06 between dwarf 
stature and normal leaves, the parental class being dwarf stature and 
liguleless leaves. The percentage of liguleless plants in the combined 
normal and brachytic group is 27.2 ± i.i, from which 20.3 ± 1.94 differ by 
6.9 ±2.23, or but slightly in excess of three times the error. 
While there seems to be no association between stature and liguleless 
leaves, there is a pronounced correlation between liguleless leaves and 
few tassel branches. This correlation is found in all three of the stature 
groups, being greatest in the brachytic and least in the dwarf. Such a 
correlation is in the nature of a coherence and may indicate a linkage 
between these characters, one of which is certainly very closely associ¬ 
ated with dwarf stature. The frequency distribution for number of 
tassel branches with respect to normal and liguleless plants of tall stature 
is shown in Figure 9. 
Tabue VII .—Biserial correlations with liguleless leaves in the second generation of dwarf - 
brachytic 
Characters correlated with liguleless. 
Population of — 
Normal stature. 
Brachytic stature. 
Dwarf stature. 
Height of plant. 
a—0.097 ±0.023 
-.oi5± .023 
-• 339 ± * ° 2 3 
-• 5 °o± -023 
—. 009± . 027 
—. I9i± . 023 
0. 031 ±0. 040 
—. 404± . 048 
—. 3o6± .047 
629± .045 
. ii6± . 061 
—. 093± . 048 
l 
0. 193 ±0. 040 
—. 346 ± .041 
—. 302± . 040 
—. 2 74± . 040 
. 269± . 112 
—.227± . 041 
Length fifth leaf. 
Width fifth leaf. 
Number of tassel branches. 
Total number of leaves. 
Leaf index. 
a Minus sign indicates a negative correlation with liguleless leaves. 
