QTL conferring fusarium crown rot resistance in the elite bread wheat variety EGA Wylie.
Fusarium crown rot (FCR) is one of the most damaging cereal diseases in semi-arid regions worldwide. The genetics of FCR resistance in the bread wheat (Triticum eastivum L.) variety EGA Wylie, the most resistant commercial variety available, was studied by QTL mapping. Three populations of recombinant inbred lines were developed with this elite variety as the resistant parent. Four QTL conferring FCR resistance were detected and resistance alleles of all of them were derived from the resistant parent EGA Wylie. One of these loci was located on the short arm of chromosome 5D (designated as Qcrs.cpi-5D). This QTL explains up to 31.1% of the phenotypic variance with an LOD value of 9.6. The second locus was located on the long arm of chromosome 2D (designated as Qcrs.cpi-2D) and explained up to 20.2% of the phenotypic variance with an LOD value of 4.5. Significant effects of both Qcrs.cpi-5D and Qcrs.cpi-2D were detected in each of the three populations assessed. Another two QTL (designated as Qcrs.cpi-4B.1 and Qcrs.cpi-4B.2, respectively) were located on the short arm of chromosome 4B. These two QTL explained up to 16.9% and 18.8% of phenotypic variance, respectively. However, significant effects of Qcrs.cpi-4B.1 and Qcrs.cpi-4B.2 were not detected when the effects of plant height was accounted for by covariance analysis. The elite characteristics of this commercial variety should facilitate the incorporation of the resistance loci it contains into breeding programs.
Commenwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, St. Lucia, Queensland, Australia; School of Plant Biology, Faculty of Science and UWA Institute of Agriculture, The University of Western Australia, Perth, Australia; National Foxtail Millet Improvement Centre, Institute of Millet Crops, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang, China.
Zhi
Z
Zheng
Diversity Arrays Technology Pty Ltd, Yarralumla, Canberra, Australia.
Andrzej
A
Kilian
School of Plant Biology, Faculty of Science and UWA Institute of Agriculture, The University of Western Australia, Perth, Australia.
Guijun
G
Yan
Commenwealth Scientific and Industrial Research Organisation (CSIRO) Plant Industry, St. Lucia, Queensland, Australia; School of Plant Biology, Faculty of Science and UWA Institute of Agriculture, The University of Western Australia, Perth, Australia.
Chunji
C
Liu
D001939:Bread; D001947:Breeding; D002874:Chromosome Mapping; D060467:Disease Resistance / Q000235:genetics*; D005670:Fusarium / Q000502:physiology*; D010935:Plant Diseases / Q000276:immunology*; D040641:Quantitative Trait Loci; D014908:Triticum / Q000033:anatomy & histology / Q000235:genetics* / Q000382:microbiology*