Haplotypes at the Phg-2 Locus Are Determining Pathotype-Specificity of Angular Leaf Spot Resistance in Common Bean

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dc.creatorNay, Michelle M.
dc.creatorMukankusi, Clare Mugisha
dc.creatorStuder, Bruno
dc.creatorRaatz, Bodo
dc.date2019-09-11
dc.date2019-09-11T20:15:31Z
dc.date2019-09-11T20:15:31Z
dc.date.accessioned2026-06-27T14:45:27Z
dc.descriptionAngular leaf spot (ALS) is one of the most devastating diseases of common bean (Phaseolus vulgaris L.) and causes serious yield losses worldwide. ALS resistance is reportedly pathotype-specific, but little is known about the efficacy of resistance loci against different pathotypes. Here, we report on ALS resistance evaluations of 316 bean lines under greenhouse and field conditions at multiple sites in Colombia and Uganda. Surprisingly, genome-wide association studies revealed only two of the five previously described resistance loci to be significantly associated with ALS resistance. Phg-2 on chromosome eight was crucial for ALS resistance in all trials, while the resistance locus Phg-4 on chromosome 4 was effective against one particular pathotype. Further dissection of Phg-2 uncovered an unprecedented diversity of functional haplotypes for a resistance locus in common bean. DNA sequence-based clustering identified eleven haplotype groups at Phg-2. One haplotype group conferred broad-spectrum ALS resistance, six showed pathotype-specific effects, and the remaining seven did not exhibit clear resistance patterns. Our research highlights the importance of ALS pathotype-specificity for durable resistance management strategies in common bean. Molecular markers co-segregating with resistance loci and haplotypes will increase breeding efficiency for ALS resistance and allow to react faster to future changes in pathogen pressure and composition.
dc.identifierhttps://hdl.handle.net/10568/103627
dc.identifier.urihttp://hdl.handle.net/123456789/87573
dc.languageen
dc.publisherFrontiers Media
dc.rightsOpen Access
dc.sourceNay, Michelle M.; Mukankusi, Clare M.; Studer, Bruno & Raatz, Bodo (2019). Haplotypes at the Phg-2 Locus Are Determining Pathotype-Specificity of Angular Leaf Spot Resistance in Common Bean. Frontiers in Plant Science. 10:1126
dc.subjectfood security
dc.subjectplant breeding
dc.subjectplant pathology
dc.subjectcommon beans
dc.subjectbeans
dc.subjectphaseolus vulgaris
dc.subjectpseudocercospora griseola
dc.titleHaplotypes at the Phg-2 Locus Are Determining Pathotype-Specificity of Angular Leaf Spot Resistance in Common Bean
dc.typeJournal Article

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