【摘要】 用普通小麦-节节麦八倍体 (2n = 56, AABBDDDD) 作母本与3种由四倍体小麦和野生二倍体物种合成的异源六倍体, 即硬粒小麦-簇毛麦 (2n = 42, AABBVV), 硬粒小麦-单芒山羊草(2 n = 42, AABBMuMu ) 和波斯小麦-小伞山羊草 (2 n = 42, AABBCu Cu) 杂交, 其杂交结实率分别为39.0% , 23.1% 和10.0% 。对所获F1 杂种的根尖细胞染色体进行C-分带,从中选出添加有一套外源物种配子染色体的七倍体杂种, 对3 种七倍体杂种进行套袋自交,其自交结实率分别为4.2% , 3.7% 和3.6% 。在F2 代中具有45 条染色体的植株最多, 含43 和48 条染色体的植株最少, 并对杂种各类配子的传递规律和产生异附加系的方法进行了讨论。更多还原

【Abstract】 Synthesized octoploid between Triticum aestivum and Aegilops squarrosa(2n=56,AABBDDDD)was crossed to three allohexaploids synthesized with tetraploid wheat and wide diploid species,i.e.Triticum durum Haynaldia villosa(2n=42,AABBVV),Triticum durum Aegilops uniaristata(2n=42,AABBM uM u)and Triticum carthlicum Aegilops unbellulata(2n=42,AABBC uC u).Seed set percentages of these crosses were 39 0%,23 1% and 10 0%,respectively.Three heptaploid hydrids contained a set of alien chromosomes derived from related species were screened by means of C banding.The spikes of plants were bagged and the self pollinated seed set percentages were 4 2%,3 7% and 3 6%,respectively.In F 2,the plants with 45 chromosomes were predominant and those with 43 and 48 chromosomes were rather rare.The transmission behavior of gametes with different chromosome numbers in hybrids and the approach of producing addition lines were also discussed. ABSTRACT Synthesized octoploid between Triticum aestivum and Aegilops squarrosa(2n=56,AABBDDDD)was crossed to three allohexaploids synthesized with tetraploid wheat and wide diploid species,i.e.Triticum durum Haynaldia villosa(2n=42,AABBVV),Triticum durum Aegilops uniaristata(2n=42,AABBM uM u)and Triticum carthlicum Aegilops unbellulata(2n=42,AABBC uC u).Seed set percentages of these crosses were 39 0%,23 1% and 10 0%,respectively.Three heptaploid hydrids contained a set of alien chromosomes derived from related species were screened by means of C banding.The spikes of plants were bagged and the self pollinated seed set percentages were 4 2%,3 7% and 3 6%,respectively.In F 2,the plants with 45 chromosomes were predominant and those with 43 and 48 chromosomes were rather rare.The transmission behavior of gametes with different chromosome numbers in hybrids and the approach of producing addition lines were also discussed. Synthesized octoploid between Triticum aestivum and Aegilops squarrosa(2n=56,AABBDDDD)was crossed to three allohexaploids synthesized with tetraploid wheat and wide diploid species,i.e.Triticum durum Haynaldia villosa(2n=42,AABBVV),Triticum durum Aegilops uniaristata(2n=42,AABBM uM u)and Triticum carthlicum Aegilops unbellulata(2n=42,AABBC uC u).Seed set percentages of these crosses were 39 0%,23 1% and 10 0%,respectively.Three heptaploid hydrids contained a set of alien chromosomes derived from related species were screened by means of C banding.The spikes of plants were bagged and the self pollinated seed set percentages were 4 2%,3 7% and 3 6%,respectively.In F 2,the plants with 45 chromosomes were predominant and those with 43 and 48 chromosomes were rather rare.The transmission behavior of gametes with different chromosome numbers in hybrids and the approach of producing addition lines were also discussed.更多还原