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 (40)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by PÄÄKKÖNEN, E.
Right arrow Articles by HOLOPAINEN, T.
Right arrow Search for Related Content
PubMed
Right arrow Articles by PÄÄKKÖNEN, E.
Right arrow Articles by HOLOPAINEN, T.
Agricola
Right arrow Articles by PÄÄKKÖNEN, E.
Right arrow Articles by HOLOPAINEN, T.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Annals of Botany 82: 49-59, 1998
© 1998 Annals of Botany Company

Responses of Leaf Processes in a Sensitive Birch (Betula pendulaRoth) Clone to Ozone Combined with Drought

E. PÄÄKKÖNEN, M. S. GÜNTHARDT-GOERG and T. HOLOPAINEN

Department of Ecology and Environmental Science, University of Kuopio, POB 1627, 70211, Kuopio, Finland Swiss Federal Institute of Forest, Snow and Landscape Research, Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland

February 28, 1998 ; March 25, 1998 .

Saplings of an ozone sensitive clone of birch (Betula pendulaRoth, KL-5-M) were well-watered or exposed to mild drought-stress combined with ambient or elevated (1.5xthe ambient) ozone for 11 weeks in open-field conditions in central Finland. Stomatal response, visible injury, chlorophyll and nutrient content, and changes in cellular anatomy and plant growth were studied. Drought stress alone, in ambient ozone, reduced stomatal density and stomatal conductance. Drought stress and ozone effects were additive, reducing total leaf number, foliage area and starch formation in mesophyll cells. Drought stress and ozone effects were additive, increasing the N concentration in the leaves, the thickness of the upper epidermal cell wall, the number of pectinaceous projections of mesophyll cell walls, and the vacuolar tannin-like depositions and phenolic droplets, regarded as signs of activated stress defence mechanisms. The increase in specific foliage mass, cytoplasmic lipids (younger leaves), and a condensed appearance of the upper epidermal mucilaginous layer were caused by both drought and ozone, but were not additive. The results show that combined drought stress contributed to birch responses to 1.5xcurrent ambient ozone concentrations, corresponding to critical-level ozone exposure. The only beneficial effect of drought stress was the slight reduction of visible leaf symptoms induced by ozone in autumnal leaves.Copyright 1998 Annals of Botany Company

Birch,Betula pendula, sensitive clone, ozone, drought, microscopy.


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


This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
E. VALKAMA, J.-P. SALMINEN, J. KORICHEVA, and K. PIHLAJA
Comparative Analysis of Leaf Trichome Structure and Composition of Epicuticular Flavonoids in Finnish Birch Species
Ann. Bot., May 1, 2003; 91(6): 643 - 655.
[Abstract] [Full Text] [PDF]


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.