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Molecular cytogenetic characterization of the dioecious Cannabis sativa with an XY chromosome sex determination system

Affiliation

  • 1 Centre for Molecular Biotechnology, Russian State Agrarian University – Moscow Timiryazev Agricultural Academy, Moscow, Russia.
  • PMID: 24465491
  • PMCID: PMC3897423
  • DOI: 10.1371/journal.pone.0085118
Free PMC article

Molecular cytogenetic characterization of the dioecious Cannabis sativa with an XY chromosome sex determination system

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Authors

Affiliation

  • 1 Centre for Molecular Biotechnology, Russian State Agrarian University – Moscow Timiryazev Agricultural Academy, Moscow, Russia.
  • PMID: 24465491
  • PMCID: PMC3897423
  • DOI: 10.1371/journal.pone.0085118

Abstract

Hemp (Cannabis sativa L.) was karyotyped using by DAPI/C-banding staining to provide chromosome measurements, and by fluorescence in situ hybridization with probes for 45 rDNA (pTa71), 5S rDNA (pCT4.2), a subtelomeric repeat (CS-1) and the Arabidopsis telomere probes. The karyotype has 18 autosomes plus a sex chromosome pair (XX in female and XY in male plants). The autosomes are difficult to distinguish morphologically, but three pairs could be distinguished using the probes. The Y chromosome is larger than the autosomes, and carries a fully heterochromatic DAPI positive arm and CS-1 repeats only on the less intensely DAPI-stained, euchromatic arm. The X is the largest chromosome of all, and carries CS-1 subtelomeric repeats on both arms. The meiotic configuration of the sex bivalent locates a pseudoautosomal region of the Y chromosome at the end of the euchromatic CS-1-carrying arm. Our molecular cytogenetic study of the C. sativa sex chromosomes is a starting point for helping to make C. sativa a promising model to study sex chromosome evolution.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1. Chromosomes of C. sativa :…

Figure 1. Chromosomes of C. sativa : C-banding/DAPI, male metaphase (a), male prometaphase (b) and…

Figure 2. Idiogram of haploid chromosome complement…

Figure 2. Idiogram of haploid chromosome complement of C. sativa, including Arabidopsis- type telomeric repeat,…

Figure 3. The meiotic chromosomes of C.…

Figure 3. The meiotic chromosomes of C. sativa at diakinesis (a) and metaphase I (b).

Figure 4. Simplified phylogeny of Cannabaceae genus…

Figure 4. Simplified phylogeny of Cannabaceae genus included in idiograms.

Hemp (Cannabis sativa L.) was karyotyped using by DAPI/C-banding staining to provide chromosome measurements, and by fluorescence in situ hybridization with probes for 45 rDNA (pTa71), 5S rDNA (pCT4.2), a subtelomeric repeat (CS-1) and the Arabidopsis telomere probes. The karyotype has 18 autosomes … ]]>