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A simple chromosomal marker can reliably distinguishes Poncirus from Citrus species

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Abstract

Several chromosome types have been recognized in Citrus and related genera by chromomycin A3 (CMA) banding patterns and fluorescent in situ hybridization (FISH). They can be used to characterize cultivars and species or as markers in hybridization and backcrossing experiments. In the present work, characterization of six cultivars of P. trifoliata (“Barnes”, “Fawcett”, “Flying Dragon”, “Pomeroy”, “Rubidoux”, “USDA”) and one P. trifoliata × C. limonia hybrid was performed by sequential analyses of CMA banding and FISH using 5S and 45S rDNA as probes. All six cultivars showed a similar CMA+ banding pattern with the karyotype formula 4B + 8D + 6F. The capital letters indicate chromosomal types: B, a chromosome with one telomeric and one proximal band; D, with only one telomeric band; F, without bands. In situ hybridization labeling was also similar among cultivars. Three chromosome pairs displayed a closely linked set of 5S and 45S rDNA sites, two of them co-located with the proximal band of the B type chromosomes (B/5S-45S) and the third one co-located with the terminal band of a D pair (D/5S-45S). The B/5S-45S chromosome has never been found in any citrus accessions investigated so far. Therefore, this B chromosome can be used as a marker to recognize the intergeneric Poncirus × Citrus hybrids. The intergeneric hybrid analyzed here displayed the karyotype formula 4B + 8D + 6F, with two chromosome types B/5S-45S and two D/5S-45S. The karyotype formula and the presence of two B/5S-45S chromosomes clearly indicate that the plant investigated is a symmetric hybrid. It also demonstrates the suitability of karyotype analyses to differentiate zygotic embryos or somatic cell fusions involving trifoliate orange germplasm.

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Acknowledgment

This work was supported by the Brazilian agencies FACEPE and CNPq.

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Authors and Affiliations

  1. Departamento de Botânica, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Rua Nelson Chaves s/n. Cidade Universitária, Recife, PE, 50.670-420, Brazil

    A. C. Brasileiro-Vidal & M. Guerra

  2. Embrapa Mandioca e Fruticultura, Cruz das Almas, BA, 44.380-000, Brazil

    J. A. dos Santos-Serejo & W. dos S. Soares Filho

Authors
  1. A. C. Brasileiro-Vidal
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  2. J. A. dos Santos-Serejo
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  3. W. dos S. Soares Filho
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  4. M. Guerra
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Corresponding author

Correspondence to A. C. Brasileiro-Vidal.

Additional information

During the submission of this paper, we analyzed 25 other citrus cultivars with the same methodology and we found that the chromosome marker reported here can indeed distinguish Poncirus trifoliata from grapefruits, pummelos, and one variegated access of Citrus, besides the previously reported access of limes, limons, citrons, and sweet-oranges. However, among 14 mandarin cultivars, two of them displayed a single B/5S-45S chromosome, whereas in Citrus hystrix D.C., a far related species belonging to the Papeda subgenus, this chromosome type was found in homozygosis. Since these two mandarin cultivars are probably of hybrid origin, we assume that for almost all commercial cultivars and species of the subgenus Citrus this B type chromosome is a useful genetic marker.

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Brasileiro-Vidal, A.C., dos Santos-Serejo, J.A., Soares Filho, W.d.S. et al. A simple chromosomal marker can reliably distinguishes Poncirus from Citrus species. Genetica 129, 273–279 (2007). https://doi.org/10.1007/s10709-006-0007-4

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  • DOI: https://doi.org/10.1007/s10709-006-0007-4

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