Sex-determining chromosomes and sexual dimorphism: insights from genetic mapping of sex expression in a natural hybrid Fragaria × ananassa subsp. cuneifolia

Publication Overview
TitleSex-determining chromosomes and sexual dimorphism: insights from genetic mapping of sex expression in a natural hybrid Fragaria × ananassa subsp. cuneifolia
AuthorsGovindarajulu R, Liston A, Ashman TL
TypeJournal Article
Journal NameHeredity
Volume110
Issue5
Year2013
Page(s)430-8
CitationGovindarajulu R, Liston A, Ashman TL. Sex-determining chromosomes and sexual dimorphism: insights from genetic mapping of sex expression in a natural hybrid Fragaria × ananassa subsp. cuneifolia. Heredity. 2013 May; 110(5):430-8.

Abstract

We studied the natural hybrid (Fragaria × ananassa subsp. cuneifolia) between two sexually dimorphic octoploid strawberry species (Fragaria virginiana and Fragaria chiloensis) to gain insight into the dynamics of sex chromosomes and the genesis of sexual dimorphism. Male sterility is dominant in both the parental species and thus will be inherited maternally, but the chromosome that houses the sex-determining region differs. Thus, we asked whether (1) the cytotypic composition of hybrid populations represents one or both maternal species, (2) the sex-determining chromosome of the hybrid reflects the location of male sterility within the maternal donor species and (3) crosses from the hybrid species show less sexual dimorphism than the parental species. We found that F. × ananassa subsp. cuneifolia populations consisted of both parental cytotypes but one predominated within each population. Genetic linkage mapping of two crosses showed dominance of male sterility similar to the parental species, however, the map location of male sterility reflected the maternal donor in one cross, but not the other. Moreover, female function mapped to a single region in the first cross, but to two regions in the second cross. Aside from components of female function (fruit set and seed set), other traits that have been found to be significantly sexually dimorphic in the pure species were either not dimorphic or were dimorphic in the opposite direction to the parental species. These results suggest that hybrids experience some disruption of dimorphism in secondary sexual traits, as well as novel location and number of quantitative trait locus (QTL) affecting sex function.

Projects
This publication contains information about 1 projects:
Project NameDescription
Strawberry sex-determining traits-Ashman-2012
Features
This publication contains information about 5 features:
Feature NameUniquenameType
Male sterilityMale sterilityheritable_phenotypic_marker
Female fertilityFemale fertilityheritable_phenotypic_marker
fruit setqFRST.M12W2-ch.VI.A-mQTL
fruit setqFRST.W7M10-ch.VI.B-mQTL
fruit setqFRST.W7M10-ch.VI.B-pQTL
Properties
Additional details for this publication include:
Property NameValue
Publication ModelPrint-Electronic
ISSN1365-2540
eISSN1365-2540
Publication Date2013 May
Journal AbbreviationHeredity (Edinb)
DOI10.1038/hdy.2012.96
Elocation10.1038/hdy.2012.96
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountryEngland
Cross References
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DatabaseAccession
PMID: PubMedPMID:23169558