Synaptic responses to concerted genomic evolution in Lathyrus. II. Intragenomic effects

Intragenomic pairing patterns have been examined in pollen mother cells (PMCs) of high chiasma frequency from C(0) autotetraploids, representing seven diploid Lathyrus species. Six species were known to display intergenomic correlations between numbers of autonomous synaptic sites and the content of...

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Bibliographic Details
Published inHeredity Vol. 70; no. 1993; pp. 92 - 97
Main Authors Wallace, A.J, Callow, R.S
Format Journal Article
LanguageEnglish
Published 1993
Subjects
autopolyploidy
chromosome pairing
chromosomes
evolution
genomics
Lathyrus
meiosis
multivalents
pollen
pollen mother cells
polyploidy
repetitive sequences
synapsis
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Summary:Intragenomic pairing patterns have been examined in pollen mother cells (PMCs) of high chiasma frequency from C(0) autotetraploids, representing seven diploid Lathyrus species. Six species were known to display intergenomic correlations between numbers of autonomous synaptic sites and the content of moderately repetitive DNA. Intragenomic variance in chromosome length is unaffected by differences in the size of the genome. Each tetrasomic set of homologues within a nucleus has a similar propensity for multivalent formation and for synaptic exchange. These observations are consistent with the view that each chromosome of a complement is equally affected by genomic changes in the content of moderately repetitive DNA, not least those sequences previously implicated in autonomous chromosomal synapsis.
ISSN:0018-067X
1365-2540