Contributions of glutenin and puroindoline genes to grain quality traits in southern Australian wheat breeding programs
H. A. Eagles A F G , Karen Cane A F , R. F. Eastwood B F , G. J. Hollamby C F , Haydn Kuchel C F , P. J. Martin D and G. B. Cornish E FA Department of Primary Industries, PB 260, Horsham, Vic. 3401, Australia.
B Australian Grain Technologies, PB 260, Horsham, Vic. 3401, Australia.
C Australian Grain Technologies, Roseworthy Campus, University of Adelaide, Roseworthy, SA 5371, Australia.
D Department of Primary Industries, Wagga Wagga Agricultural Institute, Wagga Wagga, NSW 2650, Australia.
E South Australian Research and Development Institute, GPO Box 397, Adelaide, SA 5001, Australia.
F Molecular Plant Breeding CRC, Suite 21, 2 Park Drive, Bundoora, Vic. 3083, Australia.
G Corresponding author; present address: Waite Campus, University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia. Email: Howard.Eagles@adelaide.edu.au
Australian Journal of Agricultural Research 57(2) 179-186 https://doi.org/10.1071/AR05242
Submitted: 1 July 2005 Accepted: 29 September 2005 Published: 24 February 2006
Abstract
Glutenin genes were known to influence maximum dough resistance (Rmax), dough extensibility (extensibility), and dough development time, whereas puroindoline genes were known to influence grain hardness, flour water absorption (water absorption), and milling yield. These are important determinants of grain quality of wheat in Australia. This study was conducted to investigate the combined effect of these genes on Rmax, extensibility, dough development time, water absorption, and milling yield in a large dataset assembled from the breeding programs based at Horsham, Victoria; Roseworthy, South Australia; and Wagga Wagga, New South Wales; for at least 10 seasons.
The effect of the glutenin genes on Rmax, extensibility, and dough development time was confirmed, as was the effect of the puroindoline genes on water absorption and milling yield. In addition, puroindoline genes were shown to significantly affect extensibility and dough development time. The Pina-D1a/Pinb-D1b genotype increased extensibility, dough development time, and milling yield relative to the Pina-D1b/Pinb-D1a genotype. Both of these genotypes are present in cultivars classified as hard-grained in southern Australia. Therefore, the allelic composition of both glutenin and puroindoline genes is required to predict the grain quality of hard wheat in southern Australian breeding programs. The glutenin and puroindoline genes in combination accounted for more than 50% of the genotypic variance for these traits, except for milling yield, but a substantial proportion of the genotypic variation could not be attributed to these genes, indicating that other genes affecting the traits were present in the populations of these wheat-breeding programs.
Additional keywords: dough rheology, REML, PCR, heritability, marker-assisted selection.
Acknowledgments
We thank Mr Geof Palmer and Ms Lee Mosionek and their team for the grain quality analyses conducted in South Australia, Dr Joe Panozzo and his team for the analyses conducted in Victoria, and Ms Helen Allen and her team for the analyses conducted in New South Wales. We thank Dr Mick Carrick for discussions about some of the statistical procedures. We thank the field technical teams at Roseworthy, Horsham, and Wagga Wagga for their extensive contribution.
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