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Physiological Responses of Bryophytes Thuidium tamariscinum and Hylocomium splendens to Increased Nitrogen Deposition.
- Source :
-
Annals of Botany . Jan2007, Vol. 99 Issue 1, p161-161. 1p. - Publication Year :
- 2007
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BRYOPHYTES
*VASCULAR system of plants
*EFFECT of nitrogen on plants
*NITROGEN
Subjects
Details
- Language :
- English
- ISSN :
- 03057364
- Volume :
- 99
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Annals of Botany
- Publication Type :
- Academic Journal
- Accession number :
- 27681832
- Full Text :
- https://doi.org/10.1093/aob/mcl239