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

Padmanaban, Sriram and Zhang, Peng and Sutherland, Mark W. and Martin, Anke (2018) Association between presence of Triticum timopheevii introgression and D-genome retention in hexaploid/tetraploid wheat crosses. Molecular Breeding, 38 (7 - Article 84). ISSN 1380-3743

Abstract

The 2G Triticum timopheevii introgression
harbours genes formultiple 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 F2
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 F4 generation of these populations. Six plants were identified in the F4 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 F5 generation.
Thus, the 2G segment and possibly other translocations
can be transferred into durum wheat through
hexaploid/tetraploid hybridisation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 16 Oct 2018 06:01
Last Modified: 30 Oct 2018 05:35
Uncontrolled Keywords: 2G introgression, inter-ploidy crosses, wheat breeding, T. timopheevii 2G
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
Funding Details:
Identification Number or DOI: 10.1007/s11032-018-0838-6
URI: http://eprints.usq.edu.au/id/eprint/34798

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