Cytogenetics of Chromosome Interchanges in Plants

Gupta, P. K.; Gupta, S.

doi:10.1016/b978-0-444-88259-2.50009-6

Cited by 8 publications

(1 citation statement)

References 92 publications

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“…The similar magnitude of quadrivalent frequency and the predominance of ring quadrivalents observed in each of the F, hybrids with SC indicate that the five landraces carry reasonably large translocations of similar sizes (GUPTA and GUPTA 1987). Our results are in agreement with NrsHlKAWA et al (1994) for T. dicoccoides but different from that of PERERA et al (1983), who reported the predominance of chainquadrivalents in Spanish varieties of durum wheat.…”

Section: Discussionsupporting

confidence: 80%

Cytogenetic Studies in Ethiopian Landraces of Tetraploid Wheat (Tviticum Turgidum L.). II. Spontaneous Chromosome Translocations and Fertility

Belay

Merker

2004

Hereditas

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Belay, G. and Merker, A. 1997. Cytogenetic studies in Ethiopian landraces of tetraploid wheat (Triticum turgidurn L.). 11. Spontaneous chromosome translocations and fertility. -Hereditas 126: 35-43. Lund, Sweden.Meiosis was studied in seven tetraploid (2n = 4x = 28) wheat (Triticum turgidum L.) landrace morphotypes of Ethiopian origin and one introduced durum variety, 'Boohai'. The objectives were to detect the presence of chromosome structural rearrangements by using the variety 'Senatore Cappelli' (SC) as a reference and to investigate if the previously reported low fertility (seed set) of the landraces has a chromosomal basis. All the parents exhibited a normal bivalent pairing at metaphase I (MI) except one (CD-7) that showed a relatively high proportion of pollen mother cells (PMC) with univalents (0.40/PMC). 'Boohai' and two of the landraces from Ambo district were structurally similar to SC. The remaining five landraces each differed by one translocation from SC. These, in turn, differed from each other by one or two translocations while two of the landraces carried the same translocation. However, in some of the landrace x landrace hybrids there was a tendency of restricting the formation of more than one quadrivalent per PMC. Four different translocations involving four to six chromosomes are present in the material studied. Lack of pairing, as measured by univalent frequency, vaned for the different F, hybrids. Generally, however, it was lower in the F, hybrids between the landraces than in hybrids between the landraces and SC. In almost all cases, division stages following MI proceeded as normal. Inversions were absent or too small to be detected. Meiotic irregularities have little to do with the low fertility of most of the parental landraces. In the F, hybrids, on the other hand, high univalent frequency and multivalent associations impaired seed set depending upon the cross combination. The results indicate that chromosome structural polymorphism for translocations may be common in Ethiopian tetraploid wheat landraces that might have played a role in maintaining their diversity by producing new linkage relationships. From breeding perspective, the bulk selection method and/or backcrossing to high fertility genotypes seem to be appropriate when these landraces are employed in hybridisation programmes.

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Section: Discussionsupporting

confidence: 80%

Cytogenetic Studies in Ethiopian Landraces of Tetraploid Wheat (Tviticum Turgidum L.). II. Spontaneous Chromosome Translocations and Fertility

Belay

Merker

2004

Hereditas

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Rearrangements of Chromosome Segments

et al. 1998

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Production and identification of new structural chromosome mutations in barley (Hordeum vulgare L.)

Gecheff¹

1996

Theoret. Appl. Genetics

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A total of 52 reciprocal translocations and 9 pericentric inversions were induced and identified in both standard and cytologically marked barley karyotypes using gamma-rays as the clastogenic agent. An analysis based upon Giemsa N-banding patterns and arm length measurements of the reconstructed chromosomes enabled a rather precise cytological localization of intra- and interchange breakpoints. This analysis was significantly facilitated and improved, especially for the identification of pericentric inversions, when the reconstructed karyotype T-1586 was used as starting material. The majority, if not all, of the aberration breakpoints proved to be localized in interband regions or in medial and terminal parts of the chromosomes, i.e., in regions which are deficient in constitutive heterochromatin. A great number of the structural mutations produced in this study contain specific cytological markers covering nearly all of the chromosomes of barley karyotype. This material might be of considerable interest in solving various problems of barley cytogenetics and chromosome engineering and especially in constructing a physical map of barley genome.

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Cytogenetics of Chromosome Interchanges in Plants

Cited by 8 publications

References 92 publications

Cytogenetic Studies in Ethiopian Landraces of Tetraploid Wheat (Tviticum Turgidum L.). II. Spontaneous Chromosome Translocations and Fertility

Cytogenetic Studies in Ethiopian Landraces of Tetraploid Wheat (Tviticum Turgidum L.). II. Spontaneous Chromosome Translocations and Fertility

Rearrangements of Chromosome Segments

Production and identification of new structural chromosome mutations in barley (Hordeum vulgare L.)

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