The Evaluation of advanced durum wheat genotypes for resistant to common bunt (Tilletia laevis Kuhn.) in Kermanshah province

Among the wheat bunts, wheat common bunt (CB) caused by Tilletia laevis Kuhn. is one of the most important wheat diseases which annually causes significant yieldlosses. In years 2004 to 2006 for evaluation of resistance in rainfed durum wheat advanced genotypes to CB, 9 genotypes were tested under artificial infection with teliospores of 11 collected isolates of T. laevis from Kermanshah province, west Iran. Response of each genotype to CB isolates in two years successively was recorded as the percentage of infected spikes at maturity stage. Infection lesser than 5% was considered as resistance. Consequently, G1252, Chi/Brch, Syrian-4, Heidar/Mt/Ho and Zardak genotypes had resistance to all of the isolates and Syrian- 1 showed moderate resistance to only 11 isolate and it was resistance to others.These genotypes with low degree of susceptibility to CB, were the best resistantgenotypes. 99-GBM and Omgenil-3 with the highest degree of susceptibility were the most susceptible genotypes. Multipathotype test by differential standard genotypes revealed that probably some of the promising resistant genotypes are Probably carrying Bt1, Bt4, Bt6, Bt9, Bt10, Bt11, Btp, Bt12 and Bt8,9,10 resistancegenes, but for more confirmation test of Allelism must be carried out. Other advanced genotypes with different pattern of susceptibility and resistance perhaps have unknown new resistance CB genes.