English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/108730
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Locating water in the dehydrated thallus of lichens from extreme microhabitats (Antárctica)

Autor Ascaso, Carmen ; Souza-Egipsy, Virginia ; Sancho, Leopoldo G.
Palabras clave Scanning Electron Microscopy in Back Scattered Mode(SEM-BSE)
Lichens
Low Temperature Scaning Electron Microscopy (LTSEM)
Water relations
Antárctica
EPS
Fecha de publicación 2003
EditorJ. Cramer in der Gebr. Borntraeger
Citación Bibliotheca Lichenologica 86: 215-223 (2003)
ResumenMicrobial ecology deals with interactions among microorganisms, between microorganisms and their environment, and with water relations in the microhabitat. In the desiccated state, many lichens tolérate long periods of intense stress. The present report describes the use of scanning electrón microscopy with backscattered electrón imaging (SEM-BSE) to observe - on the spatial nanometer scale - relationships among the epilithic thallus of an Antarctic Lichen, microorganisms belonging to epilithic, chasmoendolithic and cryptoendolithic communities and minerals. The main aim of the study was to determine the precise location of minute quantities of water that the thallus may maintain probably obtained from the mineral microenvironment of its rock habitat. Through low temperature scanning electrón microscopy (LTSEM), it was possible to observe ice crystals indicative of the presence of water in the dehydrated hyphae of the fungal partner of the lichen when these were crossfractured. Ice crystals were also detected among the mineral particles of the lithic substrate. Besides implications ¡n the highly controversia! topic of water distribution in the lichen thallus, the present findings suggest that under conditions of drought, the presence of small quantities of water in the apoplast may explain the survival of the dehydrated thallus.
Descripción Nueve páginas y 6 figuras
URI http://hdl.handle.net/10261/108730
ISSN1436-1698
Aparece en las colecciones: (CCMA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
thalluslichens2003.pdf5,04 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.