Theoretical and Applied Genetics

, Volume 113, Issue 3, pp 429–437 | Cite as

Inheritance and mapping of a powdery mildew resistance gene introgressed from Avena macrostachya in cultivated oat

Original Paper

Abstract

The powdery mildew resistance from Avena macrostachya was successfully introgressed into hexaploid oat (A. sativa). Genetic analysis of F1, F2, F3 and BC1 populations from two powdery-mildew resistant introgression lines revealed that the resistance is controlled by a dominant gene, tentatively designated Eg-5. Molecular marker analysis was conducted using bulked-segregant analysis in two segregating F3 populations. One codominant simple sequence repeats (SSR) marker AM102 and four AFLP-derived PCR-based markers were successfully developed. The SSR marker AM102 and the STS marker ASE41M56 were linked to the gene Eg-5, with genetic distances of 2 and 0.4 cM, respectively, in both mapping populations. Three STS markers (ASE45M56, ASE41M61, ASE36M55) co-segregated with Eg-5 in one population while two (ASE45M56, ASE36M55) of them linked to Eg-5 with a genetic distance of 1 cM in another population. The gene was further mapped to be in a region corresponding to linkage group 22_44+18 in the Kanota × Ogle (KO) hexaploid oat map by comparative mapping. To our knowledge, this is the first report of mapping powdery-mildew resistance in hexaploid oat. The new resistance source of A. macrostachya, together with the tightly linked markers identified here, could be beneficial in oat breeding programmes.

Notes

Acknowledgements

We thank Dr. P. Wehling, Dr. B. Hackauf and Dr. B. Ruge for their valuable suggestions and helpful advice.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Institute of Agricultural CropsFederal Centre for Breeding Research on Cultivated Plants (BAZ)Gross LüsewitzGermany

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