A QTL located on chromosome 4A associated with dormancy in white- and red-grained wheats of diverse origin

Mares, D. and Mrva, K. and Cheong, J. and Williams, K. and Watson, B. and Storlie, E. and Sutherland, M. and Zou, Y. (2005) A QTL located on chromosome 4A associated with dormancy in white- and red-grained wheats of diverse origin. Theoretical and Applied Genetics, 111 (7). pp. 1357-1364. ISSN 0040-5752


Improved resistance to preharvest sprouting in modern bread wheat (Triticum aestivum. L.) can be achieved via the introgression of grain dormancy and would reduce both the incidence and severity of damage due to unfavourable weather at harvest. The dormancy phenotype is strongly influenced by environmental factors making selection difficult and time consuming and this trait an obvious candidate for marker assisted selection. A highly significant quantitative trait locus(QTL) associated with grain dormancy and located on chromosome 4A was identified in three bread wheat genotypes, two white- and one red-grained, of diverse origin. Flanking SSR markers on either side of the putative dormancy gene were identified and validated in an additional population involving one of the dormant genotypes. Genotypes containing the 4A QTL varied in
dormancy phenotype from dormant to intermediate dormant. Based on a comparison between dormant redand white-grained genotypes, together with a whitegrained mutant derived from the red-grained genotype, it is concluded that the 4A QTL is a critical component of dormancy; associated with at least an intermediate dormancy on its own and a dormant phenotype when combined with the R gene in the red-grained genotype and as yet unidentified gene(s) in the white-grained genotypes. These additional genes appeared to be different in AUS1408 and SW95-50213.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: No Author's version available.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 03 Feb 2008 23:14
Last Modified: 02 Jul 2013 22:34
Uncontrolled Keywords: QTL; wheat genotypes; chromosomes; dormancy; genetic engineering; harvesting; weather; wheat
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070307 Crop and Pasture Post Harvest Technologies (incl. Transportation and Storage)
07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070601 Horticultural Crop Growth and Development
10 Technology > 1001 Agricultural Biotechnology > 100105 Genetically Modified Field Crops and Pasture
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: 10.1007/s00122-005-0065-5
URI: http://eprints.usq.edu.au/id/eprint/778

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