Association between presence of Triticum timopheevii introgression and D-genome retention in hexaploid/tetraploid wheat crosses

作者：Padmanaban, Sriram; Zhang, Peng; Sutherland, Mark W.; Martin, Anke^*

来源：Molecular Breeding, 2018, 38(7): 84.

DOI：10.1007/s11032-018-0838-6

• 2G introgression
• Inter-ploidy crosses
• Wheat breeding
• T. timopheevii 2G

The 2G Triticum timopheevii introgression harbours genes for multiple disease resistance and quality traits in bread wheat. In order to transfer this segment from bread wheat into durum, the bread wheat line Sunguard, which carries this introgressed 2G segment was crossed with three tetraploid durum parents. A significant difference was observed in the segregation ratio of the 2G segment in the different crosses at the F-2 generation with two of the three populations indicating segregation distortion against the hexaploid 2G segment. In these populations, the presence of the 2G segment was strongly correlated with the presence of D-genome chromosomes. These results were confirmed in the F-4 generation of these populations. Six plants were identified in the F-4 generation, which had retained the introgressed 2G segment in a homozygous condition and did not have a complete D-genome set. Two of these lines only had two non-homologous D-genome chromosomes in the F-5 generation. Thus, the 2G segment and possibly other translocations can be transferred into durum wheat through hexaploid/tetraploid hybridisation.

• 出版日期2018-7