Er3 gene, conferring resistance to powdery mildew in pea, is located in pea LGIV

Abstract

Three genes for resistance to Erysiphe pisi, named er1, er2 and Er3 have been described in pea so far. er1 gene is located in pea linkage group VI, while er2 gene has been mapped in LGIII. SCAR and RAPD markers tightly linked to Er3 gene have been identified, but the position of these markers in the pea genetic map was unknown. The objective of this study was to localize Er3 gene in the pea genetic map. Towards this aim, the susceptible pea cv. Messire (er3er3) and a resistant near isogenic line of Messire (cv. Eritreo, Er3Er3) were surveyed with SSRs with known position in the pea map. Three SSRs were polymorphic between “Messire” and “Eritreo” and further surveyed in two contrasting bulks formed by homozygous Er3Er3/er3er3 individuals obtained from a F2 population derived from the cross C2 (Er3Er3) × Messire (er3er3). A single marker, AA349, was polymorphic between the bulks. Subsequently, other ten markers located in the surrounding of AA349 were selected and analysed in Er3Er3 and er3er3 plants. As a results, another SSR, AD61, was found to be polymorphic between Er3Er3 and er3er3 plants. Further linkage analysis confirmed that SSRs AA349 and AD61 were linked to Er3 and to the RAPD and SCAR markers previously reported to be linked to this gene. Er3 gene was located in pea LGIV at 0.39 cM downstream of marker AD61. The location of Er3 gene in the pea map is a first step toward the identification of this gene.

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Acknowledgements

This research was supported by Projects AGL2014-52871-R and AGL2017-82907-R co-financed by FEDER.

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Correspondence to Sara Fondevilla.

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Cobos, M.J., Satovic, Z., Rubiales, D. et al. Er3 gene, conferring resistance to powdery mildew in pea, is located in pea LGIV. Euphytica 214, 203 (2018). https://doi.org/10.1007/s10681-018-2292-2

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Keywords

  • Er3 gene
  • Mapping
  • Pea powdery mildew
  • Erysiphe pisi