Document Detail


Occurrence and ultrastructure of Albugo candida on a new host, Arabis alpina in Saudi Arabia.
MedLine Citation:
PMID:  18640046     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A population of Arabis alpina (Brassicaceae) growing in Saudi Arabia was observed to be infected for the first time by the Oomycete, Albugo candida. Both conventional chemical fixation and high pressure freezing followed by freeze substitution (HPF/FS) were used to prepare zoosporangia, intercellular hyphae, haustoria, invading host cells and host-parasite interface of A. candida for study with both scanning and transmission electron microscopy. Both fixations gave good preservation of ultrastructural details and data from the two sample types were highly complementary. Scanning electron microscopic observation revealed that mature zoosporangia of A. candida are spherical or ellipsoidal in shape and characterized by a smooth surface and faint terminal secession scar at each end. Transmission electron microscopic observation indicated that coenocytic intercellular hyphae are located in intercellular spaces of host leaf tissue forming haustoria in host mesophyll cell. Each haustorium is connected to intercellular hyphae by a narrow, slender neck which enclosed by a collar as a response of host cell to infection. The cytoplasm of the haustorium contains different organelles characteristic of the Oomycetes. No obvious responses are observed in host cell organelles following infection which may be due to the presence of a compatibility between the host and the Oomycete. Modifications of the host plasma membrane around the haustorium are detected. Many tubular elements were found to be continuous with the extrahaustorial membrane. This appears to be the first report of the presence of these tubular elements in case of A. candida haustoria. These tubular elements may increase membrane surface area and consequently increase the efficacy of nutrients uptake by haustoria from host cell.
Authors:
Z A M Baka
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Publication Detail:
Type:  Journal Article     Date:  2008-06-17
Journal Detail:
Title:  Micron (Oxford, England : 1993)     Volume:  39     ISSN:  0968-4328     ISO Abbreviation:  Micron     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-09-23     Completed Date:  2009-01-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9312850     Medline TA:  Micron     Country:  England    
Other Details:
Languages:  eng     Pagination:  1138-44     Citation Subset:  IM    
Affiliation:
Department of Biology, College of Sciences, King Khalid University, Abha, P.O. Box 9004, Saudi Arabia. zakariabaka@hotmail.com
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MeSH Terms
Descriptor/Qualifier:
Arabis / microbiology*
Microscopy, Electron, Scanning
Microscopy, Electron, Transmission
Oomycetes / ultrastructure*

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


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