【摘要】 利用C-分带、FISH、SSR技术,从小麦-大赖草易位系T01~T14中筛选出8个纯合易位系,将不同易位系相互进行杂交,配制了11个杂交组合,并对各易位系及其杂种后代进行赤霉病抗性鉴定。结果表明,大赖草各易位系对赤霉病的抗性接近于苏麦3号,但不同地点及年份间差异较大。涉及不同大赖草染色体的易位系间的杂种F1与其抗性较高的易位系亲本相比抗性有所提高,但涉及大赖草Lr.7或5Lr#1同一条染色体的不同易位系间杂种F1的抗性仅位于两亲本之间。这表明位于不同大赖草染色体上的抗赤霉病基因具有累加效应,通过不同大赖草染色体易位系的聚合,可提高赤霉病的抗性。更多还原

【Abstract】 Eight different homozygous wheat-Leymus. racemosus translocation lines were selected from T01^T14 by C-banding, FISH and SSR. Eleven different crosses were made between these wheat-L. racemosus translocation lines. Fusarium head blight （FHB, wheat scab） resistance of different homozygous translocation lines and their hybrids was evaluated. All these translocation lines showed scab resistance nearly as high as that of Sumai 3, but the resistances were unstable in different years or different places. The resistance level of hybrid F₁ between the translocation lines involved different L. racemosus chromosomes was higher than that of the parent with higher resistance. But resistance level of the F₁ between different translocation lines involved the same L. racemosus chromosome 5Lr#1 or Lr.7 was only between two parents in the crosses. It indicated that there were several FHB resistance genes located on different chromosomes of L. racemosus, and showed additive effects. So FHB resistance could be enhanced by combining the resistance genes on different L. racemosus chromosomes.更多还原