QTL Mapping activities and marker-assisted selection for yield in the germplasm enhancement program of the Australian Northern Wheat Improvement Program
2000
Cooper, M. | Jensen, N.M. | Carroll, B.J. | Godwin, I.D. | Podlich, D.W. (University of Queensland, Brisbane (Australia))
The target population of environments encountered for wheat breeding in the northern grains region of Australia is highly variable and large genotype-by-environment (GxE) interactions complicate any studies of the inheritance of quantitative traits. Theoretical considerations in combination with experimental investigations of QTL models for quantitative traits and computer simulation studies of Marker-Assisted selection (MAS) have enabled the development of a quantitative framework for defining when advantages may be expected from MAS over the current phenotypic selection strategy used in the Germplasm Enhancement Program (GEP). An overview is given of the strategy that is currently being used to evaluate the scope for using MAS for improvement of the quantitative trait grain yield and associated drought resistance in the GEPA QTL mapping study investigating the grain yield variation relevant to the GEP is underway. It is anticipated that with the currently available technologies applied to the mapping population we will be able to enhance our understanding of the genetic architecture of a number of important quantitative traits segregating in the populations being improved in the GEPHowever, routine use of MAS for yield and drought resistance is not considered to be an efficient option for the GEP at this time. The reasons for this conclusion are discussed.
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