Mapping QTLs for waterlogging tolerance in wheat(Triticum aestivum L.)
Cakir, M., Waters, I., McDonald, G., Drake-Brockman, F., Stefenova, K., Verbyla, A. and Setter, T. (2011) Mapping QTLs for waterlogging tolerance in wheat(Triticum aestivum L.). In: Wheat Breeding Assembly 2011, 24 - 26 August 2011, Citigate Hotel, Perth.
Waterlogging is a major environmental stress for wheat grown in areas with high rainfall. To identify tolerant lines and determine the genomic regions carrying tolerance genes within the wheat genome, a doubled haploid (DH) mapping population from a cross of Ducula-4 (tolerant CIMMYT line) and Brookton (susceptible, adapted Western Australian wheat line) parental lines was studied. DH lines and parental lines were grown in waterlogged and non-waterlogged treatments in pots. Waterlogging was imposed at 3-4 leaf stage and continued for 6 weeks to simulate waterlogging under natural field conditions. Root and shoot growth measurements identified transgressive segregants in the population. A genetic map of the population with 184 SSR and 260 DArT markers was used to determine significant genetic regions for tolerance to waterlogging. A total of 34 QTLs were identified for waterlogged and drained (control). Notably the most significant QTLs for biomass increase were located on chromosomes 1A and 7B. Different QTLs were identified under three different soil conditions supporting that physiological responses to waterlogging are different under various soil types. This was the first study reporting QTLs for waterlogging tolerance in wheat and the results provide opportunities to breeders to conduct marker-assisted selection and the basis for identifying candidate genes from rice-wheat-barley comparative genomic studies.
|Publication Type:||Conference Item|
|Murdoch Affiliation:||Western Australian State Agricultural Biotechnology Centre|
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