Document Detail

The global genetic structure of the wheat pathogen Mycosphaerella graminicola is characterized by high nuclear diversity, low mitochondrial diversity, regular recombination, and gene flow.
MedLine Citation:
PMID:  12684018     Owner:  NLM     Status:  MEDLINE    
A total of 1673 Mycosphaerella graminicola strains were assayed for DNA fingerprints and restriction fragment length polymorphism (RFLP) markers in the nuclear and mitochondrial genomes. The isolates were collected from 17 wheat fields located in 11 countries on five continents over a six year period (1989-1995). Our results indicate that genetic diversity in the nuclear genome of this fungus was high for all but three of the field populations surveyed and that populations sampled from different continents had similar frequencies for the most common RFLP alleles. Hierarchical analysis revealed that more than 90% of global gene diversity was distributed within a wheat field, while approximately 5% of gene diversity was distributed among fields within regions and approximately 3% was distributed among regions on different continents. These findings suggest that gene flow has occurred on a global scale. On average, each leaf was colonized by a different nuclear genotype. In contrast, only seven mtDNA haplotypes were detected among the 1673 isolates and the two most common mtDNA haplotypes represented approximately 93% of the world population, consistent with a selective sweep. Analysis of multilocus associations indicated that all field populations were in gametic equilibrium, suggesting that sexual recombination is a regular occurrence globally.
J Zhan; R E Pettway; B A McDonald
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Fungal genetics and biology : FG & B     Volume:  38     ISSN:  1087-1845     ISO Abbreviation:  Fungal Genet. Biol.     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-09     Completed Date:  2003-06-19     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9607601     Medline TA:  Fungal Genet Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  286-97     Citation Subset:  IM    
Institute of Plant Sciences, Phytopathology Group, ETH Zentrum/LFW, Universitätstrasse 2, Zürich CH-8092, Switzerland.
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MeSH Terms
Ascomycota / genetics*,  pathogenicity,  physiology
DNA, Fungal / genetics
DNA, Mitochondrial / genetics
Evolution, Molecular
Gene Frequency*
Genetic Variation*
Plant Diseases / microbiology
Plant Leaves / microbiology
Polymorphism, Restriction Fragment Length
Recombination, Genetic*
Triticum / microbiology*
Reg. No./Substance:
0/DNA, Fungal; 0/DNA, Mitochondrial

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

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