Combination of Different Wheat-Leymus racemosus Translocation Lines with Wheat Scab Resistance

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 F_1 between the translocation lines involved different L. racemosus chromosomes was higher than that of the parent with higher resistance. But resistance level of the F_1 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.