The Karyotype Analysis to the Hexploid of Ae.ventricosa-T.durum

The hexaploid of Ae.ventricosa T.durum. Dest was bred first from T.durum Dest(2n=4x=28, AABB)and Ae. ventricosa (2n=4x=28, DDM vM v) and then after the natural forming octoploid type. It was not clear what the chromosome groups were. For this purpose, we has crossed the hexaploid of Ae.ventricosa T.durum with Chinese Spring(AABBDD), and made the analysis of chromosome pairing at MI of hybrid F 1. It was observed that most of them had 14 pairs of bivalents and 14 univalents. Further observation and analysis of the karyotypes of Ae.ventricosa , Chinese Spring, the hexploid from Ae. ventricosa T.durum and hybrid F 1, we found that there were the chromosomes, which had the similar arm ratio and centromere locus with M v chromosomes groups from Ae. ventricosa. So we determined preliminarily that the chromosome forming of the hexaploid of Ae. ventricosa T.durum was about AABBM vM v,while its hybrid F 1 with Chinese Spring was AABBDM v.