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A new fertility restorer locus linked closely to the Rfo locus for cytoplasmic male sterility in radish

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Abstract

In this study, we have investigated a new fertility restorer (Rf) locus for cytoplasmic male sterility (CMS) in radish. We have obtained a CMS-Rf system consisting of sterile line ‘9802A1’, maintainer line ‘9802B1’ and restorer line ‘9802H’. F1 plants from cross between sterile line ‘9802A1’ and restorer line ‘9802H’ were all male fertile, self pollination of F1 plants produced an F2 segregating population consisting of 600 individuals. The segregating population was found to fit a segregation ratio 3:1 for male fertile and sterile types, indicating that male fertility is restored by a single dominant gene (termed Rfo2) in the CMS-Rf system. Based on the DNA sequence of Rfo/Rfk1 (AJ535623), just one full length gene in the sterile line ‘9802A1’, in the restorer line ‘9802H’ and in the male fertile line ‘2006H’, was cloned, respectively. The three sequences correspond to the same gene with two alleles: Rfob in ‘9802H’ and rfob in ‘9802A1’ and ‘2006H’. These two alleles differ from Rfo/Rfk1 and rfk1 (AJ535624) alleles by two synonymous base substitutions, respectively. Based on the differences between the Rfob and rfob genes, one PCR-based marker was developed, and designated Marker 1, which is identical to the corresponding region of Rfob by sequence analysis. In the F2 segregating population described above, the Marker 1 was present in 5 sterile plants and in 453 fertile plants, absent in 4 fertile plants and in 138 sterile plants, and was found to fit a segregation ratio 3:1 indicating that Rfob was single copy in ‘9802H’. Linkage analysis showed that the Rfo2 locus for our CMS-Rf system was distant from the Rfo locus by about 1.6 cM. The sterile line ‘9802A1’ was pollinated by the male fertile line ‘2006H’ and the resulting F1 plants were all male fertile. These results indicated that the male fertility of radish CMS can be restored by a new Rf locus, which linked tightly to the Rfo locus.

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Acknowledgments

The authors thank the reviewers for helpful comments and suggestions. This work was funded, in part, by the Natural Science Foundation of Hubei province of China (2007ABA004) and by the Youth Chenguang Project of Science and Technology of Wuhan, China (200850731402).

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Authors and Affiliations

  1. Wuhan Botanical Garden/Wuhan Institute of Botany, The Chinese Academy of Sciences, Wuhan, 430074, People’s Republic of China

    Zhi Wei Wang, Yu Jie Zhang, Yuan Zhou, Guo Pei Chen & Ting Wang

  2. Key Laboratory of Ministry of Education for Horticultural Plant Biology, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China

    Zhi Wei Wang & Chang ** **ang

  3. Graduate University of the Chinese Academy of Sciences, Bei**g, 100049, People’s Republic of China

    Yu Jie Zhang

  4. Hubei Academy of Agricultural Sciences, Wuhan, 430064, People’s Republic of China

    Shi Yong Mei

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  1. Zhi Wei Wang
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  2. Yu Jie Zhang
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  3. Chang ** **ang
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  4. Shi Yong Mei
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  5. Yuan Zhou
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  6. Guo Pei Chen
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  7. Ting Wang
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Corresponding authors

Correspondence to Chang ** **ang or Ting Wang.

Additional information

Communicated by R. Hagemann.

Y. J. Zhang, C. P. **ang, S. Y. Mei, and T. Wang have equally contributed to this work.

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Wang, Z.W., Zhang, Y.J., **ang, C.P. et al. A new fertility restorer locus linked closely to the Rfo locus for cytoplasmic male sterility in radish. Theor Appl Genet 117, 313–320 (2008). https://doi.org/10.1007/s00122-008-0776-5

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