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Characterization and mapping of complementary lesion-mimic genes lm1 and lm2 in common wheat

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A lesion-mimic phenotype appeared in a segregating population of common wheat cross Yanzhan 1/Zaosui 30. The parents had non-lesion normal phenotypes. Shading treatment and histochemical analyses showed that the lesions were caused by light-dependent cell death and were not associated with pathogens. Studies over two cropping seasons showed that some lines with more highly expressed lesion-mimic phenotypes exhibited significantly lower grain yields than those with the normal phenotype, but there were no significant effects in the lines with weakly expressed lesion-mimic phenotypes. Among yield traits, one-thousand grain weight was the most affected by lesion-mimic phenotypes. Genetic analysis indicated that this was a novel type of lesion mimic, which was caused by interaction of recessive genes derived from each parent. The lm1 (lesion mimic 1) locus from Zaosui 30 was flanked by microsatellite markers Xwmc674 and Xbarc133/Xbarc147 on chromosome 3BS, at genetic distances of 1.2 and 3.8 cM, respectively, whereas lm2 from Yanzhan 1 was mapped between microsatellite markers Xgwm513 and Xksum154 on chromosome 4BL, at genetic distances of 1.5 and 3 cM, respectively. The linked microsatellite makers identified in this study might be useful for evaluating whether potential parents with normal phenotype are carriers of lesion-mimic alleles.

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The project was sponsored by the National Basic Research Project of China (2004CB117200). We are grateful to Dr. R. McIntosh, University of Sydney, for useful suggestions on the phenotyping and for revising this manuscript.

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Correspondence to Jizeng Jia.

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Communicated by M. Sorrells.

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Yao, Q., Zhou, R., Fu, T. et al. Characterization and mapping of complementary lesion-mimic genes lm1 and lm2 in common wheat. Theor Appl Genet 119, 1005–1012 (2009). https://doi.org/10.1007/s00122-009-1104-4

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  • Powdery Mildew
  • Leaf Rust
  • Fusarium Head Blight Resistance
  • Yield Trait
  • Brown Lesion