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Mapping of the Ogura fertility restorer gene Rfo and development of Rfo allele-specific markers in canola (Brassica napus L.)

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Abstract

Ogura cytoplasmic male sterility (CMS) and its corresponding nuclear fertility restorer gene, Rfo, have been introduced from radish to Brassica species by interspecific crosses. Rfo restores male fertility by altering the translational expression of Orf138, a mitochondrial gene, whose expression results in the male sterile phenotype. This system has been extensively investigated and breeding restorer lines for the Ogura CMS has become a major objective for hybrid seed production in many canola breeding programs. In this study, we have sequenced genomic clones of Rfo amplified from a canola restorer line R2000, licensed from INRA, France, and a Dow AgroSciences non-restorer line Nexera 705 using primers designed from the radish Rfo sequence (GenBank accession AJ550021). Sequence alignment revealed three homologous sequences of Rfo. Two of the sequences were present in both R2000 and Nexera 705 but the third one was present only in R2000. These results suggested that the first two sequences could be the homoeologous sequences of Rfo already existing in the canola genome and the third one could be the radish Rfo introduced into canola. Based on the sequence differences between the restorer and non-restorer lines, Rfo allele-specific PCR markers were developed. We also developed a high throughput, Rfo allele-specific Invader® assay through Third Wave Technologies. Linkage analysis revealed a co-segregation between the allele-specific marker and the phenotypes for fertility restoration. This allele-specific marker has been mapped in the linkage group N19 and proved to be very useful for direct selection of Rfo alleles for fertility restoration during marker-assisted introgression of the Ogura restorer for hybrid development in canola.

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Acknowledgements

Authors would like to thank Dr. Van Ripley and Yonghe Bai for their critical review of the manuscript and valuable comments.

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  1. Xueyi Hu

    Present address: Syngenta Seeds China, 20/F, Building A, Ocean International Center, No. 56 Dongsihuan Zhonglu Chaoyang District, Beijing, 100025, China

Authors and Affiliations

  1. Dow AgroSciences, LLC, 9330 Zionsville Road, Indianapolis, IN, 46268-1054, USA

    Xueyi Hu, Mandy Sullivan-Gilbert, Tom Kubik, Wesley Marchione, Thomas Greene & Steven A. Thompson

  2. Dow AgroSciences, LLC, 101-421 Downey Road, Saskatoon, SK, Canada, S7N-4L8

    Tom Kubik, Jason Danielson & Nathan Hnatiuk

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  1. Xueyi Hu
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  2. Mandy Sullivan-Gilbert
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Correspondence to Xueyi Hu.

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Hu, X., Sullivan-Gilbert, M., Kubik, T. et al. Mapping of the Ogura fertility restorer gene Rfo and development of Rfo allele-specific markers in canola (Brassica napus L.). Mol Breeding 22, 663–674 (2008). https://doi.org/10.1007/s11032-008-9207-1

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