Document Detail

A triallelic genetic male sterility locus in Brassica napus: an integrative strategy for its physical mapping and possible local chromosome evolution around it.
MedLine Citation:
PMID:  23243189     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND AIMS: Spontaneous male sterility is an advantageous trait for both constructing efficient pollination control systems and for understanding the developmental process of the male reproductive unit in many crops. A triallelic genetic male-sterile locus (BnMs5) has been identified in Brassica napus; however, its complicated genome structure has greatly hampered the isolation of this locus. The aim of this study was to physically map BnMs5 through an integrated map-based cloning strategy and analyse the local chromosomal evolution around BnMs5.
METHODS: A large F(2) population was used to integrate the existing genetic maps around BnMs5. A map-based cloning strategy in combination with comparative mapping among B. napus, Arabidopsis, Brassica rapa and Brassica oleracea was employed to facilitate the identification of a target bacterial artificial chromosome (BAC) clone covering the BnMs5 locus. The genomic sequences from the Brassica species were analysed to reveal the regional chromosomal evolution around BnMs5.
KEY RESULTS: BnMs5 was finally delimited to a 0·3-cM genetic fragment from an integrated local genetic map, and was anchored on the B. napus A8 chromosome. Screening of a B. napus BAC clone library and identification of the positive clones validated that JBnB034L06 was the target BAC clone. The closest flanking markers restrict BnMs5 to a 21-kb region on JBnB034L06 containing six predicted functional genes. Good collinearity relationship around BnMs5 between several Brassica species was observed, while violent chromosomal evolutionary events including insertions/deletions, duplications and single nucleotide mutations were also found to have extensively occurred during their divergence.
CONCLUSIONS: This work represents major progress towards the molecular cloning of BnMs5, as well as presenting a powerful, integrative method to mapping loci in plants with complex genomic architecture, such as the amphidiploid B. napus.
Wei Lu; Jun Liu; Qiang Xin; Lili Wan; Dengfeng Hong; Guangsheng Yang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-12-13
Journal Detail:
Title:  Annals of botany     Volume:  111     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-28     Completed Date:  2013-05-13     Revised Date:  2014-02-04    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  305-15     Citation Subset:  IM    
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MeSH Terms
Arabidopsis / genetics
Biological Evolution
Brassica napus / genetics*
Chromosome Mapping / methods*
Chromosomes, Artificial, Bacterial
Chromosomes, Plant / genetics
DNA Primers / genetics
Gene Library
Genetic Loci / genetics*
Genome, Plant / genetics*
Molecular Sequence Data
Plant Infertility / genetics*
Sequence Analysis, DNA
Reg. No./Substance:
0/DNA Primers

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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