Abstract
The rice lesion mimic mutant spotted leaf 1 ( spl1) was first identified in the rice ( Oryza sativa) cultivar Asahi in 1965. This mutant displayed spontaneous disease-like lesions in the absence of any pathogen, and was found to confer resistance to multiple isolates of rice blast. We employed a map-based cloning strategy to localize the Spl1 gene. A total of ten cleaved amplified polymorphic sequence (CAPS) markers linked to the Spl1 gene were identified and mapped to an 8.5-cM region on chromosome 12. A high-resolution genetic map was developed using these ten CAPS markers and a segregating population consisting of 3202 individuals. A BAC contig containing four BAC clones was constructed, and Spl1 was localized to a 423-kb region. Seven spl1 mutants were obtained from the IR64 deletion mutant collection, and molecular analysis using these mutants delimited the Spl1 gene to a 70-kb interval, covered by two BAC clones. These results provide the basis for cloning this gene, which is involved in cell death and disease resistance in rice.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 30028016) and the Basic Research Program (The ‘973’ Program, Grant No. TG2000016203) of the Ministry of Science and Technology of China. Work at IRRI was supported in part by the Swiss Agency for Cooperation and Development. We thank Alice Bordeos for assistance in genetic analysis and Bill Hardy for technical editing
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Communicated by R. Hagemann
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Liu, G., Wang, L., Zhou, Z. et al. Physical mapping of a rice lesion mimic gene, Spl1 , to a 70-kb segment of rice chromosome 12. Mol Genet Genomics 272, 108–115 (2004). https://doi.org/10.1007/s00438-004-1040-6
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DOI: https://doi.org/10.1007/s00438-004-1040-6