硬粒小麦—偏凸山羊草六倍体的核型分析

硬粒小麦－偏凸山羊草六倍体类型（简称硬偏麦六倍体类型）来源于硬粒小麦（Ｔ．ｄｕｒｕｍ Ｄｅｓｔ，２ｎ＝４ｘ＝２８，ＡＡＢＢ）与偏凸山羊草（Ａｅ．ｕｅｎｔｒｉｃｏｓａ，２ｎ＝４ｘ＝２８，ＤＤＭ＾ｖＭ＾ｖ）杂交并自然加倍的八倍体类型，其染色体组成还不清楚。为了研究偏麦六倍体的染色体组成，用中国春（ＡＡＢＢＤＤ）与之杂交，对杂种Ｆ１花粉母细胞进行减数分裂染色体配对分析，观察到大多数花粉母细胞有１４对二价

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.