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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
Early Events in the Evolution of the Silene latifolia Y Chromosome: Male Specialization and Recombination Arrest
Jitka Zluvova*,
,
Sevdalin Georgiev
,
Bohuslav Janousek*,
Deborah Charlesworth
,
Boris Vyskot* and
Ioan Negrutiu,1
* Department of Plant Developmental Genetics, Institute of Biophysics of the Academy of Sciences of the Czech Republic, 612 65 Brno, Czech Republic, Université de Lyon, Ecole Normale Supérieure Lyon, IFR128 BioSciences Lyon-Gerland, 69364 Lyon, France, 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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