Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (6)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Hovenden, M. J.
Right arrow Articles by Allaway, W. G.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Hovenden, M. J.
Right arrow Articles by Allaway, W. G.
Agricola
Right arrow Articles by Hovenden, M. J.
Right arrow Articles by Allaway, W. G.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Annals of Botany 73: 377-383, 1994
© 1994 Annals of Botany Company

Horizontal Structures on Pneumatophores of Avicennia marina (Forsk.) Vierh.--A New Site of Oxygen Conductance

M. J. Hovenden and W. G. Allaway

School of Biological Sciences A12, The University of Sydney, NSW 2006, Australia

Conductance of pneumatophores of the grey mangrove, Avicennia marina, to oxygen depended on lenticel number up to about 25 functional lenticels per pneumatophore, and probably on cross-sectional area of the gas space in pneumatophores with over 25. The dependence on lenticel number was far from perfect, because of a substantial non-lenticellular component of conductance. This non-lenticellular conductance was attributed to 'horizontal structures' on the most recently formed part of the pneumatophore. These were thought to result from persistent portions of the root cap which remained attached to the surface of the pneumatophore, and around which breaks in the surface of the periderm developed. Following flooding, the lenticels dried and resumed full conductance within about three minutes. Non-lenticellular conductance imputed to the horizontal structures took about ten times as long to recover after flooding. Nevertheless, these horizontal structures are likely to represent a significant pathway for admission of oxygen, especially in rapidly growing roots where the tip region lacks lenticels. A name, 'subrisules', for these horizontal structures is proposed.Copyright 1994, 1999 Academic Press

Avicennia marina (Forsk.) Vierh., Avicenniaceae, grey mangrove, pneumatophore, lenticel, conductance, oxygen electrode, aerenchyma, subrisule


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.