Document Detail

Distribution of hybrid fungal symbionts and environmental stress.
MedLine Citation:
PMID:  19290566     Owner:  NLM     Status:  MEDLINE    
Most asexual fungal symbionts of grasses in the genus Neotyphodium occurring in nature are of hybrid origin. Most hybrid Neotyphodium species result from interspecific hybridization events between pathogenic Epichloë species or co-occurring non-hybrid Neotyphodium species. Current hypotheses for the prevalence of hybrid Neotyphodium species include reduction of mutation accumulation and increased adaptive response to environmental extremes. We tested the adaptive response hypothesis by characterizing the distribution of uninfected, hybrid, and non-hybrid Neotyphodium endophytes in 24 native Arizona fescue host populations and abiotic parameters at each locality. Infection was high in all host populations (>70%), but the majority of host populations were infected by non-hybrid Neotyphodium (>50% on average). Principal component analysis indicates the frequency of plants infected with hybrid fungi is negatively related to soil nutrients and positively correlated with early spring moisture. Non-hybrid infected hosts are positively associated with soil nutrients and show a complex relationship with soil moisture (negative in early spring moisture, positive with late summer soil moisture). These results suggest the frequency of uninfected, hybrid, and non-hybrid infected plants is related to resource availability and abiotic stress factors. This supports the hypothesis that hybridization in asexual fungal symbionts increases host adaptability to extreme environments.
Cyd E Hamilton; Stan H Faeth; Thomas E Dowling
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-03-18
Journal Detail:
Title:  Microbial ecology     Volume:  58     ISSN:  1432-184X     ISO Abbreviation:  Microb. Ecol.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-14     Completed Date:  2009-08-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7500663     Medline TA:  Microb Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  408-13     Citation Subset:  IM    
School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA.
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MeSH Terms
Adaptation, Physiological*
Epichloe / growth & development*
Festuca / microbiology*
Hybridization, Genetic
Neotyphodium / growth & development*
Population Dynamics
Soil Microbiology

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

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