Inheritance of Russian Wheat Aphid resistance and efficiency of molecular markers linked to resistance genes in Iranian wheat cultivars.
2011
Najafi Mirak, Tuhid
Russian Wheat Aphid (RWA) is a serious pest of wheat, barely and other small grains in cereal-producing regions of the world. The use of resistant cultivars is an effective management strategy to control this pest. This genetic study was conducted to determine the inheritance of RWA resistance in Iranian resistant wheat, Azadi. The resistant cultivar were crossed with a susceptible cultivar, Pishtaz. Seedlings of the parents, F1, F2 and F3 were screened for resistance to RWA under greenhouse condition. 21 days after infesting, leaf chlorosis score were measured. Inheritance of resistance to RWA based on leaf chlorosis was studied using Mendelian segregation ratios. Mendelian ratios showed that resistance to RWA is controlled by one dominant major gene in Azadi. Marker selected assistance of cultivars confirmed the presence of gene Dn2 in Azadi and some other resistant Iranian cultivars.
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