title: Physiological effects of a geothermal element: boron excess in the epiphytic lichen Xanthoria parietina (L.) TH. FR.
abstract: The results of a study aimed at investigating the effects of boron excess on a set of ecophysiological parameters in the lichen Xanthoria parietina, to set up a monitoring system to trace early biological effects of boron pollution in geothermal areas, are reported. To this purpose, lichen thalli have been incubated for 24 h in solutions at boron concentrations of 0.1, 1, 10 and 100 ppm, which were within the range in bulk deposition and geothermal fluids. The results showed a general trend of decreasing sample viability and increasing cell membrane damage and membrane lipid peroxidation under increasing boron concentrations, while photosynthetic efficiency, chlorophyll degradation and the contents of H(2)O(2) and water-soluble proteins were not affected. It was argued that the fungal partner, that represents the large majority of the lichen biomass, is more sensitive to boron excess than the algal partner.
authors.affiliation: Department of Environmental Science G. Sarfatti, University of Siena, Via P.A. Mattioli 4, 53100 Siena, Italy.
authors.forename: Tommaso
authors.initials: T
authors.lastname: Pisani
authors.forename: Silvana
authors.initials: S
authors.lastname: Munzi
authors.forename: Luca
authors.initials: L
authors.lastname: Paoli
authors.forename: Martin
authors.initials: M
authors.lastname: Backor
authors.forename: Stefano
authors.initials: S
authors.lastname: Loppi
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D001203:Ascomycota / Q000187:drug effects* / Q000502:physiology; D001895:Boron / Q000633:toxicity*; D002462:Cell Membrane / Q000187:drug effects / Q000502:physiology; D004784:Environmental Monitoring; D006861:Hydrogen Peroxide / Q000378:metabolism; D008011:Lichens / Q000187:drug effects* / Q000502:physiology; D015227:Lipid Peroxidation; D013696:Temperature
chemical_list: D000393:Air Pollutants; D006861:Hydrogen Peroxide; D001895:Boron