| Scab is one of the major diseases of wheat, which results in extensive lossesworldwide. The most effective strategy for controlling this disease is through thedevelopment of resistant varieties. Identifying resistance genes and understanding thecomplex genetic structure will greatly enhance the breeding for scab-resistance.Wangshuibai, originated from Jiangsu Liyang, China, has become one of the bestresistance resources in the world due to its highly resistance. Nanda2419 is one of the mostpopular germplasm in China. Using a recombinant inbred lines (RIL) population producedby single-seed descent from the cross between Nanda2419 and Wangshuibai, a genetic mapinvolving 891 markers has been constructed.To understand the genetic basis associated with scab-resistance, an "ImmortalizedF2"population was constructed by crossing between the RILs chosen by randompermutation of the 132 RILs. The population were evaluated for the percentage of spikes(PIS) across two years and nine chromosome regions were detected for their associationwith typeâ… resistance through interval mapping, among which Qfhi.nau-1B, Qfhi.nau-4Band Qfhi.nau-5A, whose resistance alleles originated from Wangshuibai, were consistentlydetected. Through additive-dominance mode test, both of Qfhi.nau-5A and Qfhi.nau-4Bhave the additive effect as the major role for scab-resistance, and Qfhi.nau-4B also haspartial dominance effect. In addition, five pairs of interaction loci were identified. Theseresults implied that these QTLs of resistance-scab are under complex genetic control. |
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