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Originally published as Genetics Published Articles Ahead of Print on July 1, 2007.

Genetics, Vol. 177, 375-386, September 2007, Copyright © 2007
doi:10.1534/genetics.107.071175

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Early Events in the Evolution of the Silene latifolia Y Chromosome: Male Specialization and Recombination Arrest

Jitka Zluvova*,{dagger}, Sevdalin Georgiev{ddagger}, Bohuslav Janousek*, Deborah Charlesworth§, Boris Vyskot* and Ioan Negrutiu{dagger},1

* Department of Plant Developmental Genetics, Institute of Biophysics of the Academy of Sciences of the Czech Republic, 612 65 Brno, Czech Republic, {dagger} Université de Lyon, Ecole Normale Supérieure Lyon, IFR128 BioSciences Lyon-Gerland, 69364 Lyon, France, {ddagger} Faculty of Biology, Department of Genetics, Sofia University, 1164 Sofia, Bulgaria and § Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom

1 Corresponding author: Université de Lyon, ENS Lyon, Laboratoire RDP, IFR128 BioSciences Lyon-Gerland, 46 Allée d'Italie, 69364 Lyon, France.
E-mail: Ioan.Negrutiu{at}ens-lyon.fr

Understanding the origin and evolution of sex chromosomes requires studying recently evolved X–Y chromosome systems such as those in some flowering plants. We describe Y chromosome deletion mutants of Silene latifolia, a dioecious plant with heteromorphic sex chromosomes. The combination of results from new and previously described deletions with histological descriptions of their stamen development defects indicates the presence of two distinct Y regions containing loci with indispensable roles in male reproduction. We determined their positions relative to the two main sex determination functions (female suppressing and the other male promoting). A region proximal to the centromere on the Y p arm containing the putative stamen promoting sex determination locus includes additional early stamen developmental factors. A medial region of the Y q arm carries late pollen fertility factors. Cytological analysis of meiotic X–Y pairing in one of the male-sterile mutants indicates that the Y carries sequences or functions specifically affecting sex chromosome pairing.




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M. Mrackova, M. Nicolas, R. Hobza, I. Negrutiu, F. Moneger, A. Widmer, B. Vyskot, and B. Janousek
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R. Bergero, D. Charlesworth, D. A. Filatov, and R. C. Moore
Defining Regions and Rearrangements of the Silene latifolia Y Chromosome
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