Responses of Mediterranean plant species to different fire frequencies in Garraf Natural Park (Catalonia, Spain): field observations and modelling predictions.

Lloret F, Pausas JG, Vilà M (2003) Responses of Mediterranean plant species to different fire frequencies in Garraf Natural Park (Catalonia, Spain): field observations and modelling predictions. Plant Ecology 167:223-235.

Diversity patterns of plant functional types in relation to fire regime and previous land use in Mediterranean woodlands.

Lloret F, Vilà M (2003) Diversity patterns of plant functional types in relation to fire regime and previous land use in Mediterranean woodlands. Journal of Vegetation Science 14:387-398.

Funció ecològica de la biodiversitat.

Lloret F (2003) Funció ecològica de la biodiversitat. In Avila A, Terradas J (eds) Aula d'Ecologia. Cicle de conferències 2002. Servei de Publicacions, Universitat Autònoma de Barcelona, Bellaterra, pp. 29-34.

Escorrentía y granolumetría de sedimentos en suelos tratados con diversoss tipos de lodos de depuradora.

Ojeda G, Alcañiz JN, Ortiz O, Tarrasón D (2003) Escorrentía y granolumetría de sedimentos en suelos tratados con diversoss tipos de lodos de depuradora. Edafología 10: 135-145

Ozone-induced gene expression occurs via ethylene-dependent and -independent signalling

Grimmig B., Gonzalez-Perez M.N., Leubner-Metzger G., Vögeli-Lange R., Meins Jr. F., Hain R., Penuelas J., Heidenreich B., Langebartels C., Ernst D., Sandermann Jr. H. (2003) Ozone-induced gene expression occurs via ethylene-dependent and -independent signalling. Plant Molecular Biology. 51: 599-607.
Enllaç
Doi: 10.1023/A:1022385104386

Resum:

Recent studies suggest that ethylene is involved in signalling ozone-induced gene expression. We show here that application of ozone increased glucuronidase (GUS) expression of chimeric reporter genes regulated by the promoters of the tobacco class I β-1,3-glucanases (GLB and Gln2) and the grapevine resveratrol synthase (Vst1) genes in transgenic tobacco leaves. 5′-deletion analysis of the class I β-1,3-glucanase promoter revealed that ozone-induced gene regulation is mainly mediated by the distal enhancer region containing the positively acting ethylene-responsive element (ERE). In addition, application of 1-methylcyclopropene (1-MCP), an inhibitor of ethylene action, blocked ozone-induced class I β-1,3-glucanase promoter activity. Enhancer activity and ethylene-responsiveness depended on the integrity of the GCC boxes, cis-acting elements present in the ERE of the class I β-1,3-glucanase and the basic-type pathogenesis-related PR-1 protein (PRB-1b) gene promoters. The minimal PRB-1b promoter containing only the ERE with intact GCC boxes, was sufficient to confer 10-fold ozone inducibility to a GUS-reporter gene, while a substitution mutation in the GCC box abolished ozone responsiveness. The ERE region of the class I β-1,3-glucanase promoter containing two intact GCC boxes confered strong ozone inducibility to a minimal cauliflower mosaic virus (CaMV) 35S RNA promoter, whereas two single-base substitution in the GCC boxes resulted in a complete loss of ozone inducibility. Taken together, these data strongly suggest that ethylene is signalling ozone-induced expression of class I β-1,3-glucanase and PRB-1b genes. Promoter analysis of the stilbene synthase Vst1 gene unravelled different regions for ozone and ethylene-responsiveness. Application of 1-MCP blocked ethylene-induced Vst1 induction, but ozone induction was not affected. This shows that ozone-induced gene expression occurs via at least two different signalling mechanisms and suggests an additional ethylene independent signalling pathway for ozone-induced expression of genes involved in phytoalexin biosynthesis.

Llegeix més

Indications of hydraulic lift by Pinus halepensis and its effects on the water relations of neighbour shrubs.

Filella I, Peñuelas J (2003) Indications of hydraulic lift by Pinus halepensis and its effects on the water relations of neighbour shrubs. Biologia Plantarum 47:209-214.

El paisaje y la ecología del paisaje. La historia y los conceptos en torno a la idea de paisaje.

Terradas J (2003) El paisaje y la ecología del paisaje. La historia y los conceptos en torno a la idea de paisaje. In Folch R (ed) El territorio como sistema. Concepto y herramientas de ordenación. CUIMP, Centre Ernest Lluch, Territorio y Gobierno Visiones 3, Diputació de Barcelona, Barcelona, pp. 57-72.

Confirmation of low genetic diversity and multiple breeding females in a social group of Eurasian badgers from microsatellite and field data.

Domingo-Roura X, Macdonald DW, Roy MS, Marmi J, Terradas J, Woodroffe R, Burke T, Wayne RK (2003) Confirmation of low genetic diversity and multiple breeding females in a social group of Eurasian badgers from microsatellite and field data. Molecular Ecology 12:533-539.

Environmental and human factors influencing fire trends in ENSO and non-ENSO years in tropical México.

Román-Cuesta RM, Gracia M, Retana J (2003) Environmental and human factors influencing fire trends in ENSO and non-ENSO years in tropical México. Ecological Applications 13:1177-1192.

Integración se servidores de datos geográficos y navegadores de cartografía en el contaxto OGC.

Masó Pau J, Pons Fernandez X (2003) Integración se servidores de datos geográficos y navegadores de cartografía en el contaxto OGC. IX Conferencia Iberoamericana de SIG. Cáceres, 24-26 de septiembre.

Pàgines