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STS markers for powdery mildew resistance gene Pm6 in wheat

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Abstract

The powdery mildew resistance gene Pm6, transferred to common wheat from the tetraploid Triticum timopheevii, is effective in most epidemic areas for powdery mildew in China. RFLP probe BCD135 was previously associated with Pm6. In the present research, four STS primers (NAU/STSBCD135-1, NAU/STSBCD135-2, STS003 and STS004) were designed from the sequence data of BCD135. These primers were used for PCR amplification using the genomic DNA of resistant near-isogenic lines with Pm6 and their recurrent parent, cv. Prins. No polymorphic product was observed using primers STS003 and STS004; however, primers NAU/STSBCD135-1 and NAU/STSBCD135-2 amplified two and one bands, respectively, polymorphic between the resistant near-isogenic-lines and Prins. The two primers were then used to amplify the F2 population from the cross IGV1-465 (FAO163b/7*Prins) × Prins. The amplification and the powdery mildew resistance identification data were analyzed using the software Mapmaker 3.0. The results indicated that both NAU/STSBCD135-1 and NAU/STSBCD135-2 were closely linked to Pm6 with a genetic distance of 0.8 cM. A total of 175 commercial varieties without Pm6 from different ecological areas of China were tested using marker NAU/STSBCD135-2 and none of them amplified the 230 bp-specific band. This marker thus has high practicability and can be used in MAS of Pm6 in wheat breeding programs for powdery mildew resistance.

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Acknowledgments

The project was supported by the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (20020307011), the Chinese High Tech Program of China (2006AA10Z1F6, 2006AA100101) and the Program for Changjiang Scholars and Innovative Research Teams in Universities (No. 10418). We would like to thank Dr. R. McIntosh and Dr. Yiqun Weng for their critical reading of the manuscript. We are also grateful to Prof. Yilin Zhou and Prof. Xiayu Duan, Plant Protection Institute, Chinese Academy of Agricultural Sciences, for kindly supplying the Blumeria graminis isolates.

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Correspondence to Xiue Wang.

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Jianhui Ji and Bi Qin contributed equally to this work.

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Ji, J., Qin, B., Wang, H. et al. STS markers for powdery mildew resistance gene Pm6 in wheat. Euphytica 163, 159–165 (2008). https://doi.org/10.1007/s10681-007-9578-0

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  • DOI: https://doi.org/10.1007/s10681-007-9578-0

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