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AOBPreview published online on November 13, 2006
Annals of Botany, doi:10.1093/aob/mcl239
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Physiological Responses of Bryophytes Thuidium tamariscinum and Hylocomium splendens to Increased Nitrogen Deposition

M. Koranda1, S. Kerschbaum1, W. Wanek1,*, H. Zechmeister2 and A. Richter1

1 Department of Chemical Ecology and Ecosystem Research, University of Vienna, Althanstr. 14, 1090 Vienna, Austria
2 Department of Conservation Biology, Vegetation Ecology and Landscape Ecology, University of Vienna, Althanstr. 14, 1090 Vienna, Austria

* wolfgang.wanek{at}univie.ac.at

Received: 27 July 2006    Returned for revision: 5 September 2006    Accepted: 20 September 2006   

BACKGROUND AND AIMS: Increased levels of nitrogen (N) deposition lead to enhanced N contents and reduced productivity of many bryophyte species. This study aimed at elucidating the mechanisms by which enhanced N uptake may cause growth reduction of bryophytes, focusing on the effects of N addition on carbon (C) metabolism of bryophytes.

METHODS: Plantlets of Thuidium tamariscinum and Hylocomium splendens were fertilized with NH4NO3 (N load equalling 30 kg ha–1 year–1) for 80 d, including a pulse labelling experiment with 13CO2 to dissect the partitioning of carbon in response to N addition.

KEY RESULTS: Growth of T. tamariscinum was not affected by N addition, while H. splendens showed a trend towards growth reduction. Total N concentration was significantly increased by N addition in H. splendens, a significant increase in amino acid-N was found in T. tamariscinum only. In both bryophyte species, a reduction in concentration of lipids, the greatest C storage pool, as well as markedly enhanced turnover rates of C storage pools in fertilized plants were observed.

CONCLUSIONS: The results suggest that growth reduction of H. splendens under high levels of N deposition may be caused by enhanced synthesis of N-containing organic compounds, most probably of cell wall proteins. Disturbance of cellular C metabolism, as indicated by enhanced C pool turnover, may further contribute to the decline in productivity of H. splendens.

Key words: Bryophytes, nitrogen deposition, growth, Thuidium tamariscinum, Hylocomium splendens, C metabolism, amino acids


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