Document Detail

Biomechanical interaction between hyphae of two Pythium species (Oomycota) and host tissues.
MedLine Citation:
PMID:  12431454     Owner:  NLM     Status:  MEDLINE    
Forces exerted by hyphae of the phytopathogen Pythium graminicola and mammalian pathogen Pythium insidiosum were compared with the mechanical resistance of their hosts' tissues. Hyphal apices of both species exerted a mean force of 2 microN, corresponding to mean pressures of 0.19 microN microm(-2) (or MPa) for P. graminicola, and 0.14 microN microm(-2) for P. insidiosum. Experiments with glass microprobes showed that the epidermis of grass roots resisted penetration until the pressure applied at the probe tip reached 1-12 microN microm(-2). Previously published data show that mammalian skin offers even greater resistance (10-47 microN microm(-2)). Clearly, tissue strength exceeds the pressures exerted by hyphae of these pathogens, verifying that secreted enzymes must play a critical role in reducing the resistance of plant and animal tissues. It is presumed that hyphae are sufficiently powerful to bore through any obstacles remaining after enzyme action.
Erin MacDonald; Laurie Millward; J P Ravishankar; Nicholas P Money
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Fungal genetics and biology : FG & B     Volume:  37     ISSN:  1087-1845     ISO Abbreviation:  Fungal Genet. Biol.     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-11-14     Completed Date:  2003-02-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9607601     Medline TA:  Fungal Genet Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  245-9     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Elsevier Science (USA)
Department of Botany, Miami University, Oxford, OH 45056, USA.
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MeSH Terms
Hyphae / growth & development,  pathogenicity*
Plant Diseases / microbiology
Poaceae / microbiology*
Pythium / growth & development,  pathogenicity*
Species Specificity
Triticum / microbiology*

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

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