Chromosome pairing in a Lolium temulentum X Lolium perenne diploid hybrid with a low chiasma frequency

G. Jenkins; M. J. Scanlon

doi:10.1007/BF00289188

Chromosome pairing in a Lolium temulentum X Lolium perenne diploid hybrid with a low chiasma frequency

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Chromosome pairing in a Lolium temulentum X Lolium perenne diploid hybrid with a low chiasma frequency. / Jenkins, G.; Scanlon, M. J.

In: Theoretical and Applied Genetics, Vol. 73, No. 4, 01.02.1987, p. 516-522.

Research output: Contribution to journal › Article › peer-review

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@article{4f3ac7f859784218ad53c26d1a687690,

title = "Chromosome pairing in a Lolium temulentum X Lolium perenne diploid hybrid with a low chiasma frequency",

abstract = "Despite an average difference of about 50% in DNA amount, homoeologous chromosomes pair effectively at first metaphase in the diploid interspecific hybrid between Lolium temulentum and Lolium perenne. However, in the presence of accessory B chromosomes and “diploidising genes” pairing at metaphase I is severely reduced. Reconstruction of serial electron micrographs through pollen mother cell nuclei show that synaptonemal complexes are formed at pachytene between not only homoeologous but also non-homologous chromosome segments resulting in multivalent formation. These associations are largely ineffective in terms of chiasma formation and degenerate at late pachytene. It is highly probable that the pairing determinants exercise their control on chromosome pairing largely by prohibiting the siting of crossovers in homoeologously paired chromosome segments.",

keywords = "lolium, hybrid, synaptonemal complex, crossing over, meiotic pairing",

author = "G. Jenkins and Scanlon, {M. J.}",

year = "1987",

month = feb,

day = "1",

doi = "10.1007/BF00289188",

language = "English",

volume = "73",

pages = "516--522",

journal = "Theoretical and Applied Genetics",

issn = "0040-5752",

publisher = "Springer Nature",

number = "4",

}

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TY - JOUR

T1 - Chromosome pairing in a Lolium temulentum X Lolium perenne diploid hybrid with a low chiasma frequency

AU - Jenkins, G.

AU - Scanlon, M. J.

PY - 1987/2/1

Y1 - 1987/2/1

N2 - Despite an average difference of about 50% in DNA amount, homoeologous chromosomes pair effectively at first metaphase in the diploid interspecific hybrid between Lolium temulentum and Lolium perenne. However, in the presence of accessory B chromosomes and “diploidising genes” pairing at metaphase I is severely reduced. Reconstruction of serial electron micrographs through pollen mother cell nuclei show that synaptonemal complexes are formed at pachytene between not only homoeologous but also non-homologous chromosome segments resulting in multivalent formation. These associations are largely ineffective in terms of chiasma formation and degenerate at late pachytene. It is highly probable that the pairing determinants exercise their control on chromosome pairing largely by prohibiting the siting of crossovers in homoeologously paired chromosome segments.

AB - Despite an average difference of about 50% in DNA amount, homoeologous chromosomes pair effectively at first metaphase in the diploid interspecific hybrid between Lolium temulentum and Lolium perenne. However, in the presence of accessory B chromosomes and “diploidising genes” pairing at metaphase I is severely reduced. Reconstruction of serial electron micrographs through pollen mother cell nuclei show that synaptonemal complexes are formed at pachytene between not only homoeologous but also non-homologous chromosome segments resulting in multivalent formation. These associations are largely ineffective in terms of chiasma formation and degenerate at late pachytene. It is highly probable that the pairing determinants exercise their control on chromosome pairing largely by prohibiting the siting of crossovers in homoeologously paired chromosome segments.

KW - lolium

KW - hybrid

KW - synaptonemal complex

KW - crossing over

KW - meiotic pairing

UR - http://hdl.handle.net/2160/35452

U2 - 10.1007/BF00289188

DO - 10.1007/BF00289188

M3 - Article

C2 - 24241107

VL - 73

SP - 516