Cytological studies on the genus hybrids among Triticum, Secale and Aegilops, and the species hybrids in Aegilops
Kagawa, F.; Chizaki, Y.
Jap Jour Bot 7(1/2): 1-32
Chromosome behavior in the pollen mother cells of F1 hybrids was as follows: T. compactum (n=21) X S. cereale (n=7), no bivalents in over half of cells, 1-3 bivalents in remainder of cells; T. spelta (n=21) X S. cereale, no bivalents in less than half of cells, 1-4 bivalents in the balance; T. durum (n=14) X S. cereale, no bivalents in little less than half of cells, 1-5 bivalents in balance; A. triuncialis (n=14) X S. cereale, 1-7 bivalents and 0-3 trivalents; A. cylindrica (n=14) X S. cereale, 2-7, usually 4-6, bivalents and often 1 or more trivalents; A. ovata (n=14) X S. cereale, 2-5 bivalents; A. cylindrica X A. speltoides (n=7), 4-8, mostly 6-7, bivalents; A. cylindrica X A. ovata, mostly 6-9 bivalents, and 0-4 trivalents; A. cylindrica X A. ventricosa, usually 6-10 bivalents. Ring-shaped bivalents were rare except in the last 2 Aegilops crosses, in which 1/3-1/2 were of the ring type. The frequency of non-reduction and restitution nuclei in Triticum X Secale, Triticum X Aegilops, and A. cylindrica X A. speltoides crosses and the bearing of these phenomena on the origin of amphidiploids are discussed. Some autosyndesis was suspected in the Aegilops-Secale crosses.