Hayes and Garber - Cucurbit Breeding

CLASSIFICATION AND INHERITANCE IN WHEAT 77
yielding ability. A knowledge of the mode of inheritance of
each of these characters is essential to the rapid purification of a
cross.
It is not desirable in a text on plant breeding to outline variety
classifications in very great detail. As a rule the crops student
will be familiar with such classifications before studying crop
improvement. It seems sufficient to indicate genetic relationship
and to point out the characters which have been used.
Wheat Species Groups. From the middle of the last century
until the present time numerous crosses between wheat varieties
and also between species groups have been made. Extensive
crossing studies have led Tschermak (1914 a,6) to conclude that
the genetic relationships in wheat areas represented in Table XV.
TABLE XV.
WHEAT SPECIES GROUPS
Group composition