Abstract
Traditionally, hybrid seeds are produced by crossing selected inbred lines. Here we provide a proof of concept for reverse breeding, a new approach that simplifies meiosis such that homozygous parental lines can be generated from a vigorous hybrid individual. We silenced DMC1, which encodes the meiotic recombination protein DISRUPTED MEIOTIC cDNA1, in hybrids of A. thaliana, so that non-recombined parental chromosomes segregate during meiosis. We then converted the resulting gametes into adult haploid plants, and subsequently into homozygous diploids, so that each contained half the genome of the original hybrid. From 36 homozygous lines, we selected 3 (out of 6) complementing parental pairs that allowed us to recreate the original hybrid by intercrossing. In addition, this approach resulted in a complete set of chromosome-substitution lines. Our method allows the selection of a single choice offspring from a segregating population and preservation of its heterozygous genotype by generating homozygous founder lines.
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Acknowledgements
We thank T. Stoker, G. Stunnenberg, C. Pillen and H. Blankestijn for help in the greenhouse, J. van Ooijen for advice in using Joinmap, and L. Mlynarova, Y.-F. Lin and D.Z. Agudelo for their help with real-time PCR. We thank M. Koornneef, B. Zwaan and P.J. Flood for critical reading of the manuscript.
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K.v.D., C.L.C.L., H.d.J. and R.D. conceived the research. E.W. performed cytology and crosses, C.B.d.S. constructed vectors and performed genotyping and N.S.N. performed cytology and FISH. E.W. analyzed data with the help of C.B.d.S., J.J.B.K., M.R. and S.W.L.C. E.W. wrote the manuscript and made the figures with substantial contributions by J.J.B.K., M.R., S.W.L.C. and H.d.J. All authors except N.S.N. were involved in planning and design of experiments, and read and improved the manuscript.
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E. W., K.v.D., C.B.d.S., C.L.C.L. and R.D. are employees of Rijk Zwaan. H.d.J. has received research funding from Rijk Zwaan in recent years.
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Supplementary Text and Figures
Supplementary Figures 1–7, Supplementary Tables 1, 3 and 4 (PDF 735 kb)
Supplementary Table 2
Genotypes of WT and RB haploids and reconstructed heterozygotes. (XLSX 134 kb)
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Wijnker, E., van Dun, K., de Snoo, C. et al. Reverse breeding in Arabidopsis thaliana generates homozygous parental lines from a heterozygous plant. Nat Genet 44, 467–470 (2012). https://doi.org/10.1038/ng.2203
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DOI: https://doi.org/10.1038/ng.2203
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