Meiotic recombination in Turnera (Turneraceae): extreme sexual difference in rates, but no evidence for recombination suppression associated with the distyly (S) locus

To explore the rate of recombination resulting from male vs female meiosis, crosses were performed using distylous Turnera subulata as well as a cross involving the introgression of genes from T. krapovickasii into T. subulata. We assayed four loci on the chromosome bearing the S-locus as well as tw...

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Bibliographic Details
Published in:Heredity 2007-06, Vol.98 (6), p.411-418
Main Authors: Labonne, J.D.J, Hilliker, A.J, Shore, J.S
Format: Article
Language:English
Subjects:
Biology
Biomedical and Life Sciences
Biomedicine
Chromosomes
Crosses, Genetic
Cytogenetics
distyly
Ecology
Evolutionary Biology
female meiosis
Flowers & plants
gametogenesis
Gender differences
Gene loci
genes
Genes, Plant
genetic recombination
homologous recombination
Human Genetics
interspecific hybridization
introgression
male meiosis
meiosis
Meiosis - genetics
Models, Genetic
original-article
ova
Plant Genetics and Genomics
Plant reproduction
Pollen
pollination
Recombination, Genetic
Sex Characteristics
Turnera
Turnera - genetics
Turnera krapovickasii
Turnera subulata
Turneraceae
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Summary:To explore the rate of recombination resulting from male vs female meiosis, crosses were performed using distylous Turnera subulata as well as a cross involving the introgression of genes from T. krapovickasii into T. subulata. We assayed four loci on the chromosome bearing the S-locus as well as two loci on each of two other linkage groups. Substantial and consistent dimorphism in recombination rates was found with female meiosis resulting in as much as a ~6-fold increase relative to male. Aberrant single locus segregation ratios occurred for some loci, particularly when the male (pollen) parent was heterozygous and the cross involved introgressed genes. The extreme trend of greater recombination resulting from female meiosis was, however, maintained in crosses where no aberrant ratios occurred, indicating that the sex dimorphism in recombination is not the result of aberrant segregation. We also exploited this distylous species and tested whether there is recombination suppression around the S-locus because of an inversion or other chromosome rearrangement(s). We found no significant evidence for recombination suppression.
ISSN:0018-067X
1365-2540
DOI:10.1038/sj.hdy.6800957