The Effect of the Genotype of Triticum Speltoides on the Pairing of Homologous Chromosomes

Two lines of Triticum speltoides that affect chromosome pairing in hybrids with T. aestivum were treated with colchicine and autotetraploid sectors were induced. The chromosome pairing and chiasma frequency of the diploid lines and the induced autotetraploids were recorded. No differences were detected between the diploids or between the autotetraploids. It is concluded that the genotype of the low-pairing line of T. speltoides does not reduce homologous chromosome pairing and, therefore, the low pairing observed in hybrids of this line and T. aestivum must be taken to indicate a lack of homology between the chromosomes of T. speltoides and T. aestivum.