Genetic improvement of triticale for irrigated systems in south-eastern Australia: a study of genotype and genotype × environment interactions
Andrew Milgate A E , Ben Ovenden B , Dante Adorada A , Chris Lisle C , John Lacy B D and Neil Coombes AA NSW Department of Primary Industries, Wagga Wagga Agricultural Institute, Pine Gully Road, Wagga Wagga, NSW 2650, Australia.
B NSW Department of Primary Industries, Yanco Agricultural Institute, Trunk Road 80, Yanco, NSW 2703, Australia.
C School of Computing & Mathematics, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
D Current address: John Lacy Consulting, PO Box 63, Finley, NSW 2713, Australia.
E Corresponding author. Email: andrew.milgate@dpi.nsw.gov.au
Crop and Pasture Science 66(8) 782-792 https://doi.org/10.1071/CP14357
Submitted: 17 December 2014 Accepted: 17 April 2015 Published: 31 July 2015
Abstract
Research into winter cereal breeding in Australia has focused primarily on studying the effects of rainfed environments. These studies typically show large genotype × environment (GE) interactions, and the complexity of these interactions acts as an impediment to the efficient selection of improved varieties. Wheat has been studied extensively; however, there are no published studies on the GE interactions of triticale in Australia under irrigated production systems. We conducted trials on 101 triticale genotypes at two locations over 4 years under intensive irrigated management practices and measured the yield potential, GE interactions, heritability and estimated genetic gain of yield, lodging resistance and several other traits important for breeding triticale. We found that high yield potential exceeding 10 t ha–1 exists in the Australian germplasm tested and that, in these irrigated trials, genotype accounted for a high proportion of the variability in all measured traits. All genetic parameters such as heritability and estimated genetic gain were high compared with rainfed studies. Breeding of triticale with improved yield and lodging resistance for irrigated environments is achievable and can be pursued with confidence in breeding programs.
Additional keywords: triticale, irrigation, yield, lodging, genotype × environment.
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