Abstract
The chromosome affinity among the P genome from Agrop-vron and the D and HCh genomes of Triticurn and Hordeum in the absence of the Ph system controlling homoeologous chromosome pairing provides information for breeding purposes. Hybrids between two accesions of the diploid barley Hordeum chilense (HchHch) and the fertile amphiploid Triticum tuuschii-Agropyron cristatum (DDPP) were made, giving rise to the trigeneric hybrid genomic combinations HChDP from which such information could be obtained. The meiotic pairing of these hybrids using fluorescence genomic in situ hybridization (FISH) on metaphase I pollen mother cells yield data on allosyndetic and autosyndetic chromosome pairing between the three genomes. The results showed that the A. cristatum tetraploid parent of the amphiploid DDPP is a segmental alloploid. A higher pairing between the D and HCh genomes than between them and the P genome from A. cristutum is observed.
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