Linkage map of the long arm of barley chromosome 3 using C-bands and marker genes

Linde‐Laursen, Ib

doi:10.1038/hdy.1982.62

Cited by 44 publications

(10 citation statements)

References 9 publications

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“…densities but exhibit a reduced level of recombination. Therefore, no direct correlation exists between physical and genetic distances in species such as wheat and barley (111,157).…”

Section: Gene Distributionmentioning

confidence: 98%

CEREAL CHROMOSOME STRUCTURE, EVOLUTION, AND PAIRING

Moore

2000

Annu. Rev. Plant. Physiol. Plant. Mol. Biol.

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The determination of the order of genes along cereal chromosomes indicates that the cereals can be described as a single genetic system. Such a framework provides an opportunity to combine data generated from the studies on different cereals, enables chromosome evolution to be traced, and sheds light on key structures involved in cereal chromosome pairing. Centromeric and telomeric regions have been highlighted as important in these processes.

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“…densities but exhibit a reduced level of recombination. Therefore, no direct correlation exists between physical and genetic distances in species such as wheat and barley (111,157).…”

Section: Gene Distributionmentioning

confidence: 98%

CEREAL CHROMOSOME STRUCTURE, EVOLUTION, AND PAIRING

Moore

2000

Annu. Rev. Plant. Physiol. Plant. Mol. Biol.

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“…The view that barley meiotic recombination is largely suppressed in proximal chromosome regions and the hitherto mapped genes are physically located in more distal regions is based on early observations of inverted (Holm 1960;Nilan et al 1968;Kreft 1969) and translocated chromosomes (Hagberg and Hagberg 1969;Kiinzel 1982) and on linkage studies using Giemsa bands and marker genes (Linde-Laursen 1982).…”

Section: Introductionmentioning

confidence: 99%

Polymerase chain reaction mediated localization of RFLP clones to microisolated translocation chromosomes of barley

Сорокін

Marthe²,

Houben³

et al. 1994

Genome

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A new strategy has been devised and used for the physical localization of genetically mapped restriction fragment length polymorphism (RFLP) clones to barley chromosomes. Morphologically distinct translocation chromosomes from synchronized root-tip meristems were microisolated and their DNA was used as a template for polymerase chain reaction with sequence-specific primers. Four RFLP clones were assigned to cytologically defined segments of chromosome 5. This related approximately one-third of the map length of linkage group 5 to approximately one-fifth of the mitotic metaphase length of chromosome 5. The technique may substantially contribute to the connection of the RFLP-based genetic linkage maps with cytological markers of the barley chromosomes.

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“…Thus, distal chiasmata were always associated with smaller fragments than proximal chiasmata. In barley and interspecific hybrids between barley (H. vulgare) and other Hordeum species, most of the chiasmata were terminal (Linde-Laursen 1982, Bothmer et al 1983 and any fragments resulting from breakage and fusion tended to be small.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic Study of Paracentric Inversions in Tridax procumbens (Compositae)

Cequea

Buiza

et al. 2003

CYTOLOGIA

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Summary Meiotic analyses at pachytene, anaphase I and II, metaphase II and the tetrad stage were carried out on several Tridax procumbens L. plants. Aberrations such as reverse inversion loops in pachytene, dicentric bridges and (or) fragments in pollen mother cells at anaphase I and II, dicentric bridges at metaphase II and 4-7 microspores at the tetrad stage, indicated that these plants were heterozygous for a paracentric inversion, which may involve one or more homologous chromosomes. The 75% fertility showed that a simple or double crossing-over took place within inversion reverse loops between inverted and normal chromosome segments at pachytene, which reduced fertility by the formation of genetically abnormal gametes. Key words Paracentric inversions, Fertility, Meiosis, Chromosomes, Crossing-over.Tridax procumbens L. is a perennial herb, widely distributed in Mexico, The Antilles and South America. In Venezuela, it is common on roadsides and in vacant lots in towns (Aristeguieta 1964). Cytological studies have shown that 2nϭ36 (Raghavan and Ventakasubban 1941). In a paracentric inversion, if simple or double crossing-over takes place within inversion reverse loops between inverted and normal chromosome segments at pachytene, dicentric bridges and acentric fragments in some pollen mother cells (PMCs) at meiotic anaphase I and II, are observed (McClintock 1938), which reduces fertility by the formation of genetically abnormal gametes. On the other hand, if no crossovers take place, then only normal PMCs are visible at anaphase. The meiotic configurations expected at anaphase following crossovers within the inversion loop and proximal to it, have been reported by McClintock (1938), Brandham (1969), Ekberg (1974), Sybenga (1975 and Pickering (1991).This study reports different meiotic configurations at pachytene, anaphase I and II, telophase I and II, suggesting that crossing-over occurs within inversion reverse loops in a paracentric inversion of a T. procumbens population. Materials and methodsTridax procumbens seeds used in this study were collected from a naturalized population in Cumaná, Sucre State, Venezuela during the year 2000. Selected seeds from 5 plants were germinated in 50% Hoagland's solution. Seedlings approximately 7 cm long were planted in water expanded Jiffy-7 peat pellets until numerous roots were observed. Seven week-old seedlings were transferred to 5 kg polyethylene sacks containing sand, peat and soil in a 1 : 1 : 1 ratio and maintained in a greenhouse.Flower buds were harvested between 13 : 00 and 13 : 30 and fixed in ethanol: propionic acid

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Linkage map of the long arm of barley chromosome 3 using C-bands and marker genes

Cited by 44 publications

References 9 publications

CEREAL CHROMOSOME STRUCTURE, EVOLUTION, AND PAIRING

CEREAL CHROMOSOME STRUCTURE, EVOLUTION, AND PAIRING

Polymerase chain reaction mediated localization of RFLP clones to microisolated translocation chromosomes of barley

Cytogenetic Study of Paracentric Inversions in Tridax procumbens (Compositae)

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