| When "Camara" was crossed to its durum wheat parent, Ld 222, both 1B and
1D chromosomes normally remain as univalents at the metaphase I of F1
hybrids. However, in some cases it was observed that 1D and 1B chromosomes
were paired to each other. It is highly probable that such homoeologous
pairing may be considerably increased if the single 1B and 1D chromosomes
do not suffer the pairing suppression commanded by chromosome 5B (OKAMOTO
1957 and RILEY 1957). This can be slightly eliminated in tetraploid wheat
that carries a pair of homologous translocated 5B.5D chromosomes (MELLO-SAMPAYO
1972). The same is to say of the pairing between 1D and 1A in tetraploid
double monosomics for those chromosomes. Gene transfer of 1D chromosome into tetraploid wheat can be obtained through those translocated chromosomes. Chromosome 1D may contain genes that are of interest for the improvement of tetraploid wheat (KALTSIKES, EVANS and BUSHUK 1968). "Camara" can also be tested for the obtention of hexaploid triticales with better bread making properties (LARTER, TSUCHIYA and EVANS 1968). Literature cited KALTSIKES, P. J., L. E. EVANS and W. BUSHUK 1968. Durum type wheat with high bread making quality. Science 159: 211-213. LARTER, E., T. TSUCHIYA and L. EVANS 1968. Breeding and cytology of Triticale. Proc. Third Int. Wheat Genetics Symposium, Canberra: 213-221. MELLO-SAMPAYO, T. 1972. Compensated monosomic 5B-trisomic 5A plants in tetraploid wheat. Can. J. Genet. Cytol. 14: 463-475. MELLO-SAMPAYO, T. and S.J. RAMOS, MARIA 1968. Wheat aneuploidy within Europe Progress Report (Portugal). EWAC News Letter (Cambridge) 2: 38-40. MELLO-SAMPAYO, T., A. CAMARA and M. NORONHA-WAGNER 1966. Aneuploids en Triticum durum Genetica Iberica 17: 249. (Received August 3, 1973) |
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