Genetic mapping of sex determination in a wild strawberry, Fragaria virginiana, reveals earliest form of sex chromosome

Publication Overview
TitleGenetic mapping of sex determination in a wild strawberry, Fragaria virginiana, reveals earliest form of sex chromosome
AuthorsSpigler RB, Lewers KS, Main DS, Ashman TL
TypeJournal Article
Journal NameHeredity
Volume101
Issue6
Year2008
Page(s)507-517
CitationSpigler RB, Lewers KS, Main DS, Ashman TL. Genetic mapping of sex determination in a wild strawberry, Fragaria virginiana, reveals earliest form of sex chromosome. Heredity. 2008 Dec; 101(6):507-517.

Abstract

The evolution of separate sexes (dioecy) from hermaphroditism is one of the major evolutionary transitions in plants, and this transition can be accompanied by the development of sex chromosomes. Studies in species with intermediate sexual systems are providing unprecedented insight into the initial stages of sex chromosome evolution. Here, we describe the genetic mechanism of sex determination in the octoploid, subdioecious wild strawberry, Fragaria virginiana Mill., based on a whole-genome simple sequence repeat (SSR)-based genetic map and on mapping sex determination as two qualitative traits, male and female function. The resultant total map length is 2373 cM and includes 212 markers on 42 linkage groups (mean marker spacing: 14 cM). We estimated that approximately 70 and 90% of the total F. virginiana genetic map resides within 10 and 20 cM of a marker on this map, respectively. Both sex expression traits mapped to the same linkage group, separated by approximately 6 cM, along with two SSR markers. Together, our phenotypic and genetic mapping results support a model of gender determination in subdioecious F. virginiana with at least two linked loci (or gene regions) with major effects. Reconstruction of parental genotypes at these loci reveals that both female and hermaphrodite heterogamety exist in this species. Evidence of recombination between the sex-determining loci, an important hallmark of incipient sex chromosomes, suggest that F. virginiana is an example of the youngest sex chromosome in plants and thus a novel model system for the study of sex chromosome evolution.

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Featuremaps
This publication contains information about 1 maps:
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Additional details for this publication include:
Property NameValue
DOI10.1038/hdy.2008.100
eISSN1365-2540
Elocation10.1038/hdy.2008.100
ISSN1365-2540
Journal AbbreviationHeredity (Edinb)
Journal CountryEngland
LanguageEnglish
Language Abbreng
Publication Date2008 Dec
Publication ModelPrint-Electronic
Publication TypeJournal Article
Publication TypeResearch Support, U.S. Gov't, Non-P.H.S.
Cross References
This publication is also available in the following databases:
DatabaseAccession
AGL: USDA National Agricultural LibraryAGL:4174774
PMID: PubMedPMID:18797475