Detection of QTLs for heat tolerance in wheat measured by grain filling duration

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, 144 recombinant inbred lines derived from the cross of Kauz and MTRWA116 along with the parents and ten local cultivars were evaluated by normal and late sowing in a rectangular lattice design in a very hot area.Grain filling duration was used as a measure of heat tolerance.One hundred and sixty six SSR and 3 AFLP markers were used to construct a linkage map containing 18 linkage groups and covering 16 chromosomes of wheat.With the method of composite interval mapping one major QTL was detected for heat tolerance, measured by grain filling duration, on chromosomes 2D.Closely linked to Xgwm484, the QTL was appeared in both normal and stressed conditions.