Early Events in the Evolution of the Silene latifolia Y Chromosome: Male Specialization and Recombination Arrest
- 1 September 2007
- journal article
- Published by Oxford University Press (OUP) in Genetics
- Vol. 177 (1) , 375-386
- https://doi.org/10.1534/genetics.107.071175
Abstract
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.Keywords
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