Brazilian Origin and Inheritance of a Heterozygous Reciprocal Chromosome Translocation in Wheat (Triticum aestivum L.)

Cytological Investigation of R1 and R2-Generations of Spontaneously and Colchicine Induced Diploid Anther Derived Wheat Plants.

“…Of most frequent chromosomal structural modifications detected in the present work was the occurrence of heterozygous reciprocal translocation which could be deduced from multivalent formation (tri-and quadrivalents) in more than 5% of PMCs at MI (Riley et al 1967). Such translocations may have significant genetic consequences in wheat (Berzonsky 1996), since they produce in their progenies duplicate-deficient gametes with abnormal chromosome numbers resulting in aneuploidy, reduction of uniformity, and complication of selection process in breeding material. Another type of structural modifications was the occurrence of chromosome breaks, particularly in the centromeric region which resulted in the formation of telocentrics, isochromosomes and heteromorphic bivalents, all of which has been observed in our examined regenerants.…”