QTL Analysis for Resistance to Sunn pest (Eurygaster integriceps) in Bread Wheat Using SSR and AFLP Markers

Wheat is usually injured by sunn pest (Eurygaster integriceps) and this damage is important for farmers and bakers. The sunn pest is very serious in IRAN. Using of resistant varieties in integrated management program is one of the suitable methods. In order to map the Quantitative Trait Loci (QTLs) for sunn pest resistance in bread wheat and to determine the contribution of each QTL in phenotypic variations، a F2:3 derived population from crossing between cv. FALAT (resistant) and line 12 (susceptible) were evaluated. The traits under study included: weight of five damaged spikes، weight of damaged seed in damaged spikes، weight of fifty damaged seeds and damaged seed percent. The linkage map was constructed using 35 SSR and 68 AFLP markers. The markers were assigned to 27 linkage groups using linkage analysis. Total map length was 875. 6 cM with an average interval size of 12. 9 cM. For damaged seed percent، as important trait، four QTLs were identified which explained 44% of the phenotypic variations. According to these results one can hope to identify the related traits with resistance using molecular markers and QTL analysis.