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用染色体 N—分带技术对四倍体小麦(AABB 和 AAGG)以及 B 和 G 染色体组的可能供体拟斯卑尔脱山羊草(Ae.speltoides)、高大山羊草(Ae.longissima)、沙融山羊草(Ae.sharonensis)、二角山羊草(Ae.bicornis)和西尔斯山羊草 Ae.se-arsii 的体细胞染色体进行核型分析。除染色体4 A 以外的所有 A 组染色体只有较浅的 N—带或无带。B 组和 G 组染色体(4 B 和 G 4除外)的 N—带较深,但G 组染色体的异染色质化程度更高。拟斯卑尔脱山羊草的 N—带型比山羊草Sitopsis 组的其它种更接近于 B 组和 G 组染色体的 N—带型(4 B 和 G 4除外)。其中有一对染色体的 N—带型与四倍体小麦的4A 很相似。用硬粒小麦“Langdon”的双端体二体(double ditelosomics)材料与提莫菲维小麦(T.timopheevi)、阿拉拉特小麦(T.araraticum)和拟斯卑尔脱山羊草杂交,对 F_1植株花粉母细胞减数分裂中期Ⅰ的染色体进行 N—分带和对端体染色体的配对行为的观察结果表明,染色体4A 应重标为4B(在 AAGG 中应重标为G4),该染色体起源于拟斯卑尔脱山羊草。拟斯卑尔脱山羊草是 B 和 G 染色体组的供体之一。
The possible mechanisms of tetraploid wheat (AABB and AAGG) and the possible donor of Aedespeltoides, Ae.longissima, The karyotype analysis was performed on somatic chromosomes of Ae.sharonensis, Ae.bicornis and Ae.se-arsii. All Group A chromosomes except for chromosome 4 A had only a shallow N-band or band. The N-band of B and G chromosomes (except for 4 B and G 4) was deep, but the G-group chromosomes had a higher degree of heterochromatinization. The N-banding of S. pilosex was closer to that of the B and G chromosomes (except for 4 B and G 4) than the other species of goat Sitopsis. There is a pair of chromosome N-band type and tetraploid wheat 4A is very similar. Hybrids were made with timopheevi, T.araraticum and Pseudoperphaeus gracilis using double ditelosomics materials from Durum Observations on the N-banding and pairing behavior of the chromosomes of metaphase I in the pollen mother cell meiotic metapopulation of F_1 showed that chromosome 4A should be reprogrammed to 4B (G4 reprogrammed in AAGG), and the chromosome Originated in the Pegasus goat grass. Siberian goat grass is one of the donors for the B and G genomes.