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Title of Journal: Mol Breeding

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Abbravation: Molecular Breeding

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Springer Netherlands

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DOI

10.1007/s004660050212

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1572-9788

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Molecular mapping of powdery mildew resistance gen

Authors: W G Xu C X Li L Hu L Zhang J Z Zhang H B Dong G S Wang
Publish Date: 2009/12/30
Volume: 26, Issue: 1, Pages: 31-38
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Abstract

The Chinese winter wheat cultivar Zhoumai 22 is highly resistant to powdery mildew The objectives of this study were to map a powdery mildew resistance gene in Zhoumai 22 using molecular markers and investigate its allelism with Pm13 A total of 278 F2 and 30 BC1 plants and 143 F3 lines derived from the cross between resistant cultivar Zhoumai 22 and susceptible cultivar Chinese Spring were used for resistance gene tagging The 137 F2 plants from the cross Zhoumai 22/27615 Pm13 were employed for the allelic test of the resistance genes Two hundred and ten simple sequence repeat SSR markers were used to test the two parents and resistant and susceptible bulks Subsequently seven polymorphic markers were used for genotyping the F2 and F3 populations The results indicated that the powdery mildew resistance in Zhoumai 22 was conferred by a single dominant gene designated PmHNK tentatively flanked by seven SSR markers Xgwm299 Xgwm108 Xbarc77 Xbarc84 Xwmc326 Xwmc291 and Xwmc687 on chromosome 3BL The resistance gene was closely linked to Xwmc291 and Xgwm108 with genetic distances of 38 and 103 cM respectively and located on the chromosome bin 3BL706310 in the test with a set of deletion lines Seedling tests with seven isolates of Blumeria graminis f sp tritici Bgt and allellic test indicated that PmHNK is different from Pm13 and Pm41 seems also to be different from PmHNK due to its origin from T dicoccoides and molecular evidence These results indicate that PmHNK is likely to be a novel powdery mildew resistance gene in wheatThe authors thank Prof B S Gill and Xiue Wang for the provision of cytogenetic stocks and Jishan Niu and Yuli Song for their technical assistance This work was supported by the grants from the Ministry of Science and Technology of China 2006AA10Z1F5 2006BAD13B0209 2009CB118301 and Fundamental and Frontier Technology Research Program of Henan province092300410012

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