Hayes and Garber - Cucurbit Breeding

CLASSIFICATION AND INHERITANCE OF SMALL GRAINS 103
TABLE XVII. INHERITANCE OF 4 INDEPENDENTLY INHERITED MENDELIAN
CHARACTERS
EXPECTATION OBTAINED
Hooded, two-rowed, black, hulled 129 . 113
Hooded, two-rowed, black, naked 43.0 43
Hooded, two-rowed, white, hulled 43 . 42
Hooded, six-rowed, black, hulled 43 . 56
Bearded, two-rowed, black, hulled. 43 . 45
Hooded, two-rowed, white, naked 14.3 14
Hooded, six-rowed, black, naked 14. 3 15
Hooded, six-rowed, white, hulled 14 . 3 14
Bearded; two-rowed, black, naked 14.3 14
Bearded, two-rowed, white, hulled 14.3 17
Bearded, six-rowed, black, hulled 14.3 14
Hooded, six-rowed, white, naked 4.8 4
Bearded, two-rowed, white, naked 4.8 6
Bearded, six-rowed, black, naked 4.8 6
Bearded, six-rowed, white, hulled 4.8 4
Bearded, two-rowed, white, naked 1.6 1
Totals 407 . 6 408
Biffen found that there was a correlation between the black
color of the grain and the color of the palea in barley crosses.
Two Japanese workers, Miyazawa (1918) and So (1918), independently,
have found xenia when white-seeded varieties
were
pollinated with black-seeded strains.
Winter versus Spring Habit. Fruwirth (1909) lists spring
forms as dominant over winter as the usual mode of inheritance.
Gaines (1917) has obtained some winter forms from spring
crosses. In one cross he obtained 18.75 per cent, winter plants
and 81.25 per cent, spring plants in F 2 Results were explained
.
by supposing one variety to carry a factor for winter habit which
was prevented from expression by an inhibitory factor. The
other parent was considered to lack both factors.
Density of the Spike. Biffen (I907b) studied two crosses
between barleys which differ in the length of internode of the
spike. He found the FI nearly as lax as the nutans parent and
obtained curves in F 2 which indicated that there was one main
factor difference. Some of the more dense F 2 segregates were
tested in F 3 . From 65 plants so tested, 55 proved homozygous
for the dense condition.
A biometrical study of inheritance of density 1
in a number of
1 The average length of internode in the middle of the spike was obtained
by measuring the length of 10 central internodes, in millimeters, and pointing
off one place.