Document Detail


Sex-determining chromosomes and sexual dimorphism: insights from genetic mapping of sex expression in a natural hybrid Fragaria × ananassa subsp. cuneifolia.
MedLine Citation:
PMID:  23169558     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
R Govindarajulu; A Liston; T-L Ashman
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-11-21
Journal Detail:
Title:  Heredity     Volume:  110     ISSN:  1365-2540     ISO Abbreviation:  Heredity (Edinb)     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-04-17     Completed Date:  2014-01-06     Revised Date:  2014-05-08    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity (Edinb)     Country:  England    
Other Details:
Languages:  eng     Pagination:  430-8     Citation Subset:  IM    
Data Bank Information
Bank Name/Acc. No.:
GENBANK/JX064433;  JX064434;  JX064435;  JX064436;  JX064437;  JX064438;  JX064439;  JX064440;  JX064449;  JX064450;  JX064451;  JX064452;  JX064453;  JX064454;  JX064455;  JX064456
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MeSH Terms
Descriptor/Qualifier:
Chimera
Chromosome Mapping / methods
Chromosomes, Plant*
Fragaria / genetics*
Genetics, Population
Molecular Sequence Data
Phenotype
Quantitative Trait Loci
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