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Chromosome structure of Triticum timopheevii relative to T. turgidum.
Genome. 2000 Dec; 43(6):923-30.G

Abstract

The chromosome structure of four different wild populations and a cultivated line of Triticum timopheevii (2n = 28, AtAtGG) relative to Triticum turgidum (2n = 28, AABB) was studied, using genomic in situ hybridisation (GISH) and C-banding analysis of meiotic configurations in interspecific hybrids. Two wild accessions and the cultivated line showed the standard C-banding karyotype. The other two accessions are homozygous for translocation 5At/3G and translocations 1G/2G and 5G/6G. GISH analysis revealed that all the T. timopheevii accessions carry intergenome translocations 6At/1G and 1G/4G and identified the position of the breakpoint in translocation 5At/3G. C-banding analysis of pairing at metaphase I in the hybrids with T. turgidum provides evidence that four species-specific translocations (6AtS/1GS, 1GS/4GS, 4GS/4AtL, and 4AtL/3AtL) exist in T. timopheevii, and that T. timopheevii and T. turgidum differ in the pericentric inversion of chromosome 4A. Bridge plus acentric fragment configurations involving 4AL and 4AtL were identified in cells at anaphase I. This result suggests that the paracentric inversion of 4AL from T. turgidum does not exist in T. timopheevii. Both tetraploid species have undergone independent and distinct evolutionary chromosomal rearrangements. The position, intercalary or subdistal, of the breakpoints in species-specific translocations and inversions contrasts with the position, at or close to the centromere, of intraspecific translocations. Different mechanisms for intraspecific and species-specific chromosome rearrangements are suggested.

Authors+Show Affiliations

Departamento de Genética, Facultad de Biología, Universidad Complutense, Madrid, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11195344

Citation

Rodríguez, S, et al. "Chromosome Structure of Triticum Timopheevii Relative to T. Turgidum." Genome, vol. 43, no. 6, 2000, pp. 923-30.
Rodríguez S, Perera E, Maestra B, et al. Chromosome structure of Triticum timopheevii relative to T. turgidum. Genome. 2000;43(6):923-30.
Rodríguez, S., Perera, E., Maestra, B., Díez, M., & Naranjo, T. (2000). Chromosome structure of Triticum timopheevii relative to T. turgidum. Genome, 43(6), 923-30.
Rodríguez S, et al. Chromosome Structure of Triticum Timopheevii Relative to T. Turgidum. Genome. 2000;43(6):923-30. PubMed PMID: 11195344.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chromosome structure of Triticum timopheevii relative to T. turgidum. AU - Rodríguez,S, AU - Perera,E, AU - Maestra,B, AU - Díez,M, AU - Naranjo,T, PY - 2001/2/24/pubmed PY - 2001/3/10/medline PY - 2001/2/24/entrez SP - 923 EP - 30 JF - Genome JO - Genome VL - 43 IS - 6 N2 - The chromosome structure of four different wild populations and a cultivated line of Triticum timopheevii (2n = 28, AtAtGG) relative to Triticum turgidum (2n = 28, AABB) was studied, using genomic in situ hybridisation (GISH) and C-banding analysis of meiotic configurations in interspecific hybrids. Two wild accessions and the cultivated line showed the standard C-banding karyotype. The other two accessions are homozygous for translocation 5At/3G and translocations 1G/2G and 5G/6G. GISH analysis revealed that all the T. timopheevii accessions carry intergenome translocations 6At/1G and 1G/4G and identified the position of the breakpoint in translocation 5At/3G. C-banding analysis of pairing at metaphase I in the hybrids with T. turgidum provides evidence that four species-specific translocations (6AtS/1GS, 1GS/4GS, 4GS/4AtL, and 4AtL/3AtL) exist in T. timopheevii, and that T. timopheevii and T. turgidum differ in the pericentric inversion of chromosome 4A. Bridge plus acentric fragment configurations involving 4AL and 4AtL were identified in cells at anaphase I. This result suggests that the paracentric inversion of 4AL from T. turgidum does not exist in T. timopheevii. Both tetraploid species have undergone independent and distinct evolutionary chromosomal rearrangements. The position, intercalary or subdistal, of the breakpoints in species-specific translocations and inversions contrasts with the position, at or close to the centromere, of intraspecific translocations. Different mechanisms for intraspecific and species-specific chromosome rearrangements are suggested. SN - 0831-2796 UR - https://www.unboundmedicine.com/medline/citation/11195344/Chromosome_structure_of_Triticum_timopheevii_relative_to_T__turgidum_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=11195344.ui DB - PRIME DP - Unbound Medicine ER -