Abstract
Powdery mildew caused by Blumeria graminis f.sp.tritici(Bgt) is one of the major fungal diseases of wheat,and the use of resistant cultivars is the most effective disease control approach.Here,the International Triticeae Mapping Initiative(ITMI) W7984 × Opata85 wheat recombinant inbred population was used for powdery mildew resistance genetic study.Resistance complex trait was dissected into component traits as papilla index(PI),papilla scale(PC),haustorium index(HI) and secondary hypha index(SI) of several successive timepoint at early stage of Bgt infection.The change trends of PI and HI with time were both controlled by single main effect genes.With quantitative trait analysis,34 resistance-related QTLs including 21 main effect QTLs were found and distributed in wheat 1B,1D,2B,3A,3B,3D,4A,4B,4D,5B,6A,6B,6D,7B,and 7D chromosomes.QTL QPmPI16.tn-7B,which regulated the formation of papilla,had the largest effect,singly accounting for 48.69% of the phenotypic variance.Locus of QPmPI16.tn-7B promoting papilla formation was derived from the parent Opata85.Colocalized QTLs were found among different component traits.Component trait-specific QTLs may provide more information about the genetic mechanism of wheat powdery mildew resistance.
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