Abstract
Three genes, er1, er2 and Er3, conferring resistance to powdery mildew (Erysiphe pisi) in pea have been described so far. Because single gene-controlled resistance tends to be overcome by evolution of pathogen virulence, accumulation of several resistance genes into a single cultivar should enhance the durability of the resistance. Molecular markers linked to genes controlling resistance to E. pisi may facilitate gene pyramiding in pea breeding programs. Molecular markers linked to er1 and er2 are available. In the present study, molecular markers linked to Er3 have been obtained. A segregating F2 population derived from the cross between a breeding line carrying the Er3 gene, and the susceptible cultivar ‘Messire’ was developed and genotyped. Bulk Segregant Analysis (BSA) was used to identify Random Amplified Polymorphic DNA (RAPD) markers linked to Er3. Four RAPD markers linked in coupling phase (OPW04_637, OPC04_640, OPF14_1103, and OPAH06_539) and two in repulsion phase (OPAB01_874 and OPAG05_1240), were identified. Two of these, flanking Er3, were converted to Sequence Characterized Amplified Region (SCAR) markers. The SCAR marker SCW4637 co-segregated with the resistant gene, allowing the detection of all the resistant individuals. The SCAR marker SCAB1874, in repulsion phase with Er3, was located at 2.8 cM from the gene and, in combination with SCW4637, was capable to distinguish homozygous resistant individuals from heterozygous with a high efficiency. In addition, the validation for polymorphism in different genetic backgrounds and advanced breeding material confirmed the utility of both markers in marker-assisted selection.
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We thank INIA for providing a grant to the senior author and projects FP6-FOOD-CT-2004-506223 and AGL2005-10181 for financial support.
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Fondevilla, S., Rubiales, D., Moreno, M.T. et al. Identification and validation of RAPD and SCAR markers linked to the gene Er3 conferring resistance to Erysiphe pisi DC in pea. Mol Breeding 22, 193–200 (2008). https://doi.org/10.1007/s11032-008-9166-6
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DOI: https://doi.org/10.1007/s11032-008-9166-6