title: Physiological, anatomical and biomass partitioning responses to ozone in the Mediterranean endemic plant Lamottea dianae.
abstract: Ozone effects on the perennial forb Lamottea dianae were studied in an open-top chamber experiment. Ozone was found to induce reductions in CO₂ assimilation and water use efficiency in the leaves of this species. These reductions were mainly related to a decline in the in vivo CO₂ fixation capacity of Rubisco (V(c,max)), rather than to stomatal limitations or photoinhibitory damage (F(v):F(m)). In addition to chloroplast degeneration, other observed effects were callose accumulation, formation of pectinaceous wart-like cell wall exudates and phloem alterations. Moreover, ozone exposure significantly reduced root dry biomass. The possible relevance of these adverse effects for Mediterranean forbs is commented. These results show that endemic plants can be very sensitive to ozone, suggesting that risks associated with this pollutant should be taken into account for conservation purposes.
authors.affiliation: Instituto Universitario CEAM-UMH, Charles R. Darwin 14, Parc Tecnològic, 46980 Paterna, Valencia, Spain. calatayud_viclor@gva.es
authors.forename: Vicent
authors.initials: V
authors.lastname: Calatayud
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: García-Breijo
authors.forename: Júlia
authors.initials: J
authors.lastname: Cervero
authors.forename: José
authors.initials: J
authors.lastname: Reig-Armiñana
authors.forename: María José
authors.initials: MJ
authors.lastname: Sanz
mesh_terms: D019659:Asteraceae / Q000187:drug effects* / Q000502:physiology; D018533:Biomass; D002245:Carbon Dioxide / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism; D018384:Oxidative Stress; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D013030:Spain
chemical_list: D002734:Chlorophyll; D002245:Carbon Dioxide; D010126:Ozone