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Flow Karyotyping and Sorting of Mitotic Chromosomes of Barley (Hordeum vulgare L.)

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Abstract

A high-yield method for isolation of barley chromosomes in suspension, their analysis and sorting using flow cytometry is described. To accumulate meristem root tip cells at metaphase, actively growing roots were subjected to subsequent treatment with 2 mmol/L hydroxyurea for 18 h, 2.5 μmol/L amiprophos methyl for 2 h, and ice water (overnight). This treatment resulted in metaphase indices exceeding 50%. Synchronized root tips were fixed in 2% formaldehyde for 20 min and chromosomes were released into a lysis buffer by mechanical homogenization, producing, on average, 5 × 105 chromosomes from 50 root tips. The isolated chromosomes were morphologically intact and suitable for flow cytometric analysis and sorting. While it was possible to discriminate and sort only one chromosome from a barley cultivar with standard karyotype, up to three chromosomes could be sorted in translocation lines with morphologically distinct chromosomes. The purity of chromosome fractions, estimated after PRINS with primers specific for GAA microsatellites, reached 97%. PCR with chromosome-specific primers confirmed the purity and suitability of flow-sorted chromosomes for physical mapping of DNA sequences.

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Authors and Affiliations

  1. Institute of Experimental Botany, Sokolovská 6, CZ-772 00, Olomouc, Czech Republic

    M. A. Lysák, J. ČíUhalíková, M. Kubaláková, H. Šimková & J. Doležel

  2. Institute of Plant Genetics and Crop Plant Research, Correnstrasse 3, D-06466, Gatersleben, Germany

    G. Künzel

Authors
  1. M. A. Lysák
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  2. J. ČíUhalíková
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  3. M. Kubaláková
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  4. H. Šimková
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  5. G. Künzel
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  6. J. Doležel
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Correspondence to J. Doležel.

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Lysák, M.A., ČíUhalíková, J., Kubaláková, M. et al. Flow Karyotyping and Sorting of Mitotic Chromosomes of Barley (Hordeum vulgare L.). Chromosome Res 7, 431–444 (1999). https://doi.org/10.1023/A:1009293628638

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