Carbon-based secondary and structural compounds in Mediterranean shrubs growing near a natural CO2 spring
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Castells, Eva (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Joffre, Richard (Centre d'Ecologie Fonctionnelle et Evolutive)
Tognetti, Roberto (Università degli Studi del Molize. Dipartimento di Scienze Animali, Vegetali e dell'Ambiente)

Fecha:	2002
Resumen:	We studied carbon-based secondary and structural compounds (CBSSCs) in Myrtus communis, Erica arborea, and Juniperus communis co-occurring in a natural CO2 spring site and in a nearby control site in a Mediterranean environment. Leaf concentrations of phenolics and CBSSCs, such as lignin, cellulose, and hemicellulose, total nonstructural carbohydrates (TNCs), and lipids were measured monthly (phenolics) and every two months (the other compounds) throughout a year. There was a slight seasonal trend towards maximum concentrations of most of these CBSSCs during autumn-winter and minimum values during the spring season, particularly in Myrtus communis. For most of the CBSSCs and species, there were no consistent or significant patterns in response to the elevated [CO2] (c. 700 μmol mol−1) of the spring site. These results were not due to a dilution effect by increased structural or nonstructural carbon. Therefore, in contrast to many experimental studies of CO2 enrichment, mainly conducted for short periods, there were no greater concentrations of phenolics, and, as in many of these studies, there were neither greater concentrations of the other CBSSCs. These results do not agree with the predictions of the carbon source-sink hypotheses. Possible causes of this disagreement are discussed. These causes include the complex heterogeneous environmental conditions and the variability of resource availabilities in the field, photosynthetic down-regulation, and/or the homeostatic and evolutionary nature of organisms. These results suggest evolutionary adaptive responses to changes in CO2. They also suggest caution in attributing increased CBSSC concentrations to elevated [CO2] at long-term scale in natural conditions, and therefore in their implications for plant-herbivore interactions and for decomposition.
Nota:	Altres ajuts: CICYT/CLI99-0479
Nota:	Altres ajuts: CICYT/REN-2000-0278/CLI
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Cellulose ; Erica arborea ; Juniperus communis ; Lignin ; Lipids ; Myrtus communis ; Phenolics ; Total nonstructural carbohydrates ; Cel · lulosa ; Lignina ; Lípids ; Fenòlics ; Carbohidrats no estructurals ; Celulosa ; Lípidos ; Fenólicos ; Carbohidratos no estructurales
Publicado en:	Global change biology, Vol. 8, Núm. 3 (March 2002) , p. 281-288, ISSN 1365-2486

DOI: 10.1046/j.1365-2486.2002.00466.x

8 p, 118.7 KB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias de la salud y biociencias > Grupo de Investigación en Ecología Química y Toxicología
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Artículos > Artículos de investigación
Artículos > Artículos publicados