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Genetics and mapping of a new leaf rust resistance gene in Triticum aestivum L. × Triticum timopheevii Zhuk. derivative ‘Selection G12’

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Abstract

A Triticum timopheevii-derived bread wheat line, Selection G12, was screened with 40 pathotypes of leaf rust pathogen, Puccinia triticina at seedling stage and with two most commonly prevalent pathotypes 77-5 and 104-2 at adult plant stage. Selection G12 showed resistance at both seedling and adult plant stages. Genetic analysis in F1, F2 and F2:3 families at the seedling stage revealed that leaf rust resistance in Selection G12 is conditioned by a single incompletely dominant gene. The leaf rust resistance gene was mapped to chromosome 3BL with SSR markers Xgwm114 and Xgwm547 flanking the gene at a distance of 28.3 cM and 6 cM, respectively. Based on the nature of resistance and chromosomal location, it is inferred that Selection G12 carries a new gene for leaf rust resistance, tentatively named as LrSelG12.

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Acknowledgements

Authors are grateful to Dr R. A. McIntosh and Dr K. V. Prabhu for their critical suggestions during preparation of the manuscript and the ICAR-IIWBR, Regional Station, Flowerdale, Shimla, for providing the initial inoculum of leaf rust pathotypes. AKS is grateful to IARI for granting Junior Research Fellowship during the course of study.

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Correspondence to AMIT KUMAR SINGH.

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Corresponding editor: Arun Joshi

[Singh A. K., Sharma J. B., Vinod, Singh P. K., Singh A. and Mallick N. 2017 Genetics and mapping of a new leaf rust resistance gene in Triticum aestivum L. × Triticum timopheevii Zhuk. derivative ‘Selection G12’. J. Genet. 96, xx–xx]

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SINGH, A.K., SHARMA, J.B., VINOD et al. Genetics and mapping of a new leaf rust resistance gene in Triticum aestivum L. × Triticum timopheevii Zhuk. derivative ‘Selection G12’. J Genet 96, 291–297 (2017). https://doi.org/10.1007/s12041-017-0760-4

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