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Characterization of the powdery mildew resistance locus in wheat breeding line Jimai 809 and its breeding application

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Abstract

Powdery mildew, caused by Blumeria graminis f. sp. tritici (Bgt), is a severe disease that affects the yield and quality of wheat. Popularization of resistant cultivars in production is the preferred strategy to control this disease. In the present study, the Chinese wheat breeding line Jimai 809 showed excellent agronomic performance and high resistance to powdery mildew at the whole growth stage. To dissect the genetic basis for this resistance, Jimai 809 was crossed with the susceptible wheat cultivar Junda 159 to produce segregation populations. Genetic analysis showed that a single dominant gene, temporarily designated PmJM809, conferred the resistance to different Bgt isolates. PmJM809 was then mapped on the chromosome arm 2BL and flanked by the markers CISSR02g-1 and CIT02g-13 with genetic distances 0.4 and 0.8 cM, respectively, corresponding to a physical interval of 704.12–708.24 Mb. PmJM809 differed from the reported Pm genes on chromosome arm 2BL in origin, resistance spectrum, physical position and/or genetic diversity of the mapping interval, also suggesting PmJM809 was located on a complex interval with multiple resistance genes. To analyze and screen the candidate gene(s) of PmJM809, six genes related to disease resistance in the candidate interval were evaluated their expression patterns using an additional set of wheat samples and time-course analysis post-inoculation of the Bgt isolate E09. As a result, four genes were speculated as the key candidate or regulatory genes. Considering its comprehensive agronomic traits and resistance findings, PmJM809 was expected to be a valuable gene resource in wheat disease resistance breeding. To efficiently transfer PmJM809 into different genetic backgrounds, 13 of 19 closely linked markers were confirmed to be suitable for marker-assisted selection. Using these markers, a series of wheat breeding lines with harmonious disease resistance and agronomic performance were selected from the crosses of Jimai 809 and several susceptible cultivars.

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All data supporting the findings of this study are included in the paper or are available from the corresponding authors on request.

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Acknowledgements

We are grateful to Prof. Hongxing Xu, School of Life Sciences, Henan University, for providing the Blumeria graminis f. sp. tritici (Bgt) isolates.

Funding

This research was financially supported by the National Natural Science Foundation of China (32072053, 32301923), Key Research and Development Project of Yantai City (2022XCZX092, 2023ZDCX023) and Co-construction State Key Laboratory of Wheat and Maize Crop Science (SKL2022KF09).

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PM and YJ conceived the research. YZ, GH, YQ, BX, JW and ZQ performed the experiments. XH, RL, JZ and LS analyzed the data. YZ and YQ performed the phenotypic assessment. JS and YZ developed the experimental materials. YJ wrote the manuscript. All authors approved the final manuscript.

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Correspondence to Yuli Jin or Pengtao Ma.

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We declare that these experiments comply with the ethical standards in China.

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The authors declare no competing interests.

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Zhao, Y., Han, G., Qie, Y. et al. Characterization of the powdery mildew resistance locus in wheat breeding line Jimai 809 and its breeding application. Mol Breeding 44, 28 (2024). https://doi.org/10.1007/s11032-024-01467-8

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  • DOI: https://doi.org/10.1007/s11032-024-01467-8

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