Hayes and Garber - Cucurbit Breeding

162 BREEDING CROP PLANTS
with the pink gave carmine and pink in a ratio of 1:1. This
indicates that carmine and pink differ in one genetic factor.
In a cross of carmine and white the FI was all light carmine.
F z
there were 54 carmine, 95 light carmine, 26 dark pink, 38 light
pink, and 65 white. Some of the extracted whites revealed a
tinge of color. Crosses of extracted whites with pink gave 32
carmine and 62 pink, showing that extracted whites sometimes
carried a carmine factor. The factor relations are not entirely
clear.
Quantitative Characters. Many of the so-called size characters
of tobacco are of great commercial importance. For this reason
their mode of inheritance is of much interest to the breeder.
Extensive studies of inheritance of these size characters have
been made. Inheritance of leaf number will be given as an
example of a common type
this group.
of inheritance of size
In
characters in
Sumatra, which averages 27 leaves, was crossed with
Broadleaf, which gives an average of 19.4 leaves. The results
for the parents and FI to F 3 generations as obtained at the Connecticut
Station are given in Table XXXVII (Hayes, East, and
Beinhart, 1913).
TABLE XXXVII. INHERITANCE OF LEAF NUMBER IN CROSS (403 X 401)
SUMATRA X BROADLEAF
Number