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Characterization of a leaf rust-resistant wheat–Thinopyrum ponticum partial amphiploid BE-1, using sequential multicolor GISH and FISH

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Abstract

In situ hybridization (multicolor GISH and FISH) was used to characterize the genomic composition of the wheat–Thinopyrum ponticum partial amphiploid BE-1. The amphiploid is a high-protein line having resistance to leaf rust (Puccinia recondita f. sp. tritici) and powdery mildew (Blumeria graminis f. sp. tritici) and has in total 56 chromosomes per cell. Multicolor GISH using J, A and D genomic probes showed 16 chromosomes originating from Thinopyrum ponticum and 14 A genome, 14 B genome and 12 D genome chromosomes. Six of the Th. ponticum chromosomes carried segments different from the J genome in their centromeric regions. It was demonstrated that these alien chromosome segments did not originate from the A, B or D genomes of wheat, so the translocation chromosomes were considered to be Js type chromosomes carrying segments similar to the S genome near the centromeres. Rearrangements between the A and D genomes of wheat were detected. FISH using Afa family, pSc119.2 and pTa71 probes allowed the identification of all the wheat chromosomes present and the determination of the chromosomes involved in the translocations. The 4A and 7A chromosomes were identified as being involved in intergenomic translocations. The replaced wheat chromosome was identified as 7D. The localization of these repetitive DNA clones on the Th. ponticum chromosomes of the amphiploid was described in the present study. On the basis of their multicolor FISH patterns, the alien chromosomes could be arranged in eight pairs and could also be differentiated unequivocally from each other.

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Acknowledgments

This study was supported by a Hungarian GVOP grant (GVOP-3.1.1.-2004-05-0007/3.0) and by the Hungarian Wheat Ear Consortium (OM-00018/2004). The authors gratefully acknowledge the technical assistance of Mrs. I. Bucsi and Mrs. J. Havasi. Thanks are due to Dr. G. Linc and Dr. E. Benavente for their useful comments on the results and to B. Harasztos for revising the manuscript linguistically.

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  1. Agricultural Research Institute of the Hungarian Academy of Sciences, P.O. Box 19, 2462, Martonvásár, Hungary

    A. Sepsi, I. Molnár, D. Szalay & M. Molnár-Láng

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  1. A. Sepsi
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  2. I. Molnár
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  3. D. Szalay
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  4. M. Molnár-Láng
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Correspondence to M. Molnár-Láng.

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Communicated by B. Friebe.

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Sepsi, A., Molnár, I., Szalay, D. et al. Characterization of a leaf rust-resistant wheat–Thinopyrum ponticum partial amphiploid BE-1, using sequential multicolor GISH and FISH. Theor Appl Genet 116, 825–834 (2008). https://doi.org/10.1007/s00122-008-0716-4

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