Yield of synthetic backcross-derived lines in rainfed environments of Australia |
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Authors: | Francis C Ogbonnaya Gouyou Ye Richard Trethowan Fernanda Dreccer Douglas Lush John Shepperd Maarten van Ginkel |
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Institution: | 1.Department of Primary Industries,Primary Industries Research Victoria (PIRVic),Horsham,Australia;2.CSIRO Plant Industry, Cooper Laboratory,University of Queensland,Gatton,Australia;3.International Maize and Wheat Improvement Center (CIMMYT),el Batan,Mexico;4.Department of Primary Industries and Fisheries,Agency for Food and Fibre Sciences,Toowoomba,Australia;5.Molecular Plant Breeding Cooperative Research Centre,Bundoora,Australia;6.Plant Breeding Institute,University of Sydney,Camden,Australia |
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Abstract: | Wheat is one of the major food crops in the world. It is Australia’s largest crop and most important agricultural commodity.
In Australia the crop is grown under rainfed conditions with inherently important regional environmental differences; wheat
growing areas are characterized by winter dominant rainfall in southern and western Australia and summer rainfall in northern
Australia. Maximizing yield potential across these diverse regions is dependent upon managing, either genetically or agronomically,
those factors in the environment that limit yield. The potential of synthetic backcross lines (SBLs) to increase yield in
the diverse agroecological zones of Australia was investigated. Significant yield advantages were found for many of the SBLs
across diverse environments. Depending on the environment, the yield of the SBLs ranged from 8% to 30% higher than the best
local check in Australia. Apart from adaptation to semiarid water stressed conditions, some SBLs were also found to be significantly
higher yielding under more optimal (irrigated) conditions. The four testing environments were classified into two groups,
with the northern and southern environments being in separate groups. An elite group of SBLs was identified that exhibited
broad adaptation across all diverse Australian environments included in this study. Other SBLs showed specific adaptation
to either northern or southern Australia. This study showed that SBLs are likely to provide breeders with the opportunity
to significantly improve wheat yield beyond what was previously possible in a number of diverse production environments. |
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Keywords: | Aegilops tauschii Synthetic backcross wheat lines (SBLs) Drought Triticum aestivum Yield |
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