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Exploring the quantitative resistance to Pseudomonas syringae pv. phaseolicola in common bean (Phaseolus vulgaris L.)

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Abstract

Pseudomonas syringae pv. phaseolicola is an important disease that causes halo blight in common bean. The genetic mechanisms underlying quantitative halo blight resistance are poorly understood in this species, as most disease studies have focused on qualitative resistance. The present work examines the genetic basis of quantitative resistance to the nine halo blight races in different organs (primary and trifoliate leaf, stem and pod) of an Andean recombinant inbred line (RIL) progeny. Using a multi-environment quantitative trait locus (QTL) map** approach, 76 and 101 main-effect and epistatic QTLs were identified, respectively. Most of the epistatic interactions detected were due to loci without detectable QTL additive main effects. Main and epistatic QTLs detected were mainly consistent across the environment conditions. The homologous genomic regions corresponding to 26 of the 76 main-effect detected QTLs were positive for the presence of resistance-associated gene cluster encoding nucleotide-binding and leucine-rich repeat (NL) proteins and known defence genes. Main-effect QTLs for resistance to races 3, 4 and 5 in leaf, stem and pod were located on chromosome 2 within a 3.01-Mb region, where a cluster of nine NL genes was detected. The NL gene Phvul.002G323300 is located in this region, which can be considered an important putative candidate gene for the non-organ-specific QTL identified here. The present research provides essential information not only for the better understanding of the plant-pathogen interaction but also for the application of genomic assisted breeding for halo blight resistance in common bean.

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Acknowledgements

This work was financially supported by the Ministerio de Economía y Competitividad (AGL2011-25562, RF2012-C00026-C02-01 and RF2012-C00026-C02-02 projects), Junta de Andalucía (Grant P12-AGR-01482 funded by Programa de Excelencia) and UE-FEDER Program. The authors would also like to thank Campus de Excelencia Internacional Agroalimentario-CeiA3 for partially supporting this work, and the Secretaría de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT) from the Ecuadorian Government for a fellowship to L. Godoy. We are indebted to Dr. J. Murillo from Departamento de Producción Agraria de la Universidad Pública de Navarra, Spain, for kindly supplying bacterial strains and his advice in inoculation methods.

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Correspondence to Marta Santalla.

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González, A.M., Yuste-Lisbona, F.J., Godoy, L. et al. Exploring the quantitative resistance to Pseudomonas syringae pv. phaseolicola in common bean (Phaseolus vulgaris L.). Mol Breeding 36, 166 (2016). https://doi.org/10.1007/s11032-016-0589-1

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  • DOI: https://doi.org/10.1007/s11032-016-0589-1

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