Mapping QTLs for Heat Tolerance in Wheat

Heat stress is a major environmental stress limiting wheat productivity in most cereal growing areas of the world. In order to map and characterize quantitative trait loci controlling heat tolerance, ۱۴۴ recombinant inbred lines deriving from the cross of Kauz and MTRWA۱۱۶ were assessed in a greenhouse and growth chamber at ۳۵°C. One hundred and sixty six SSR and ۳ AFLP markers were used to construct a linkage map containing ۱۸ linkage groups and covering ۱۶ chromosomes of wheat. Using the composite interval mapping method, three QTLs were detected for heat tolerance and measured by the Fischer susceptibility index, on chromosomes ۱B, ۵B and ۷B. The alleles of both parents contributed to heat tolerance. A large amount of explained phenotypic variances and small confidence intervals indicate that the linkage information between markers and QTLs could easily be used in breeding for heat tolerance.

Keywords:

Wheat , Heat tolerance , Linkage map , QTL , Recombinant inbred lines