(1) In the triploid wheat hybrids (A)×(A+B),
Triticum dicoccum _??_+×
T. monococcum _??_ and
T. aegilopoides boeoticum, _??_×
T. dicoccum _??_, we have found various modifications of the normal chromosome combination (7
II+ 7
I), for instance, 3 trivalent chromosomes, which consist of the union of 3 bivalents and 3 univalents. The number of trivalents varies from 0 to 3 (Table 2).
In some cases there is a tetrapartite chromosome (not tetravalent).
(2) In the tetraploid hybrid (A)×(A+B+D) between
T. spelta and
T. aegilopoides boeoticum. 0-3 trivalents and 0-3 bivalents from autosyndesis of chromosomes of B- and D-sets besides 7 normal bivalents were observed (Tab. 3).
The tetraploid hybrid was weakly fertile (Tab. 4).
(3) We saw the normal chromosome combination 14
II+7
I in nearly all the cases of
T. durum×
T. vulgare (A+B)×(A+B+D), and 1-2 trivalents rarely (Tab. 5).
(4) The relationship among the chromosomes of 3 different sets, A, B and D, may be given as follows;_??_
A-3-B means that 3 chromosomes from A- and B-sets have affinity to conjugate.
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