Sex chromosomes in flowering plants
Open Access
- 1 February 2007
- journal article
- research article
- Published by Wiley in American Journal of Botany
- Vol. 94 (2), 141-150
- https://doi.org/10.3732/ajb.94.2.141
Abstract
Sex chromosomes in dioecious and polygamous plants evolved as a mechanism for ensuring outcrossing to increase genetic variation in the offspring. Sex specificity has evolved in 75% of plant families by male sterile or female sterile mutations, but well‐defined heteromorphic sex chromosomes are known in only four plant families. A pivotal event in sex chromosome evolution, suppression of recombination at the sex determination locus and its neighboring regions, might be lacking in most dioecious species. However, once recombination is suppressed around the sex determination region, an incipient Y chromosome starts to differentiate by accumulating deleterious mutations, transposable element insertions, chromosomal rearrangements, and selection for male‐specific alleles. Some plant species have recently evolved homomorphic sex chromosomes near the inception of this evolutionary process, while a few other species have sufficiently diverged heteromorphic sex chromosomes. Comparative analysis of carefully selected plant species together with some fish species promises new insights into the origins of sex chromosomes and the selective forces driving their evolution.Keywords
Funding Information
- National Science Foundation (DBI‐0553417)
This publication has 84 references indexed in Scilit:
- Steps in the evolution of heteromorphic sex chromosomesHeredity, 2005
- A Gradual Process of Recombination Restriction in the Evolutionary History of the Sex Chromosomes in Dioecious PlantsPLoS Biology, 2004
- A primitive Y chromosome in papaya marks incipient sex chromosome evolutionNature, 2004
- The male-specific region of the human Y chromosome is a mosaic of discrete sequence classesNature, 2003
- DMY is a Y-specific DM-domain gene required for male development in the medaka fishNature, 2002
- Archaefructaceae, a New Basal Angiosperm FamilyScience, 2002
- Sex Determination by Sex Chromosomes in Dioecious PlantsPlant Biology, 2001
- Substitution rate comparisons between grasses and palms: synonymous rate differences at the nuclear gene Adh parallel rate differences at the plastid gene rbcL.Proceedings of the National Academy of Sciences of the United States of America, 1996
- Nuclear DNA content of some important plant speciesPlant Molecular Biology Reporter, 1991
- A gene from the human sex-determining region encodes a protein with homology to a conserved DNA-binding motifNature, 1990