Document Detail


Biomechanical interaction between hyphae of two Pythium species (Oomycota) and host tissues.
MedLine Citation:
PMID:  12431454     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
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)
Affiliation:
Department of Botany, Miami University, Oxford, OH 45056, USA.
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MeSH Terms
Descriptor/Qualifier:
Biomechanics*
Humans
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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