Effects of combined ozone and cadmium stresses on leaf traits in two poplar clones (Articolo in rivista)

Type
Label
  • Effects of combined ozone and cadmium stresses on leaf traits in two poplar clones (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s11356-014-3481-8 (literal)
Alternative label
  • Antonella Castagna, Daniela Di Baccio , Anna Maria Ranieri, Luca Sebastiani, Roberto Tognetti (2014)
    Effects of combined ozone and cadmium stresses on leaf traits in two poplar clones
    in Environmental Science and Pollution Research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Antonella Castagna, Daniela Di Baccio , Anna Maria Ranieri, Luca Sebastiani, Roberto Tognetti (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Scienze Agrarie, Alimentari e Agro-Ambientali, Universit√† di Pisa, Via del Borghetto 80, 56124 Pisa, Italy; BioLabs, Istituto di Scienze della Vita, Scuola Superiore Sant'Anna, Piazza Martiri della Libert√† 33, 56127 Pisa, Italy; Istituto di Biologia Agroambientale e Forestale, Consiglio Nazionale delle Ricerche, Via Salaria km 29,300, 00015 Monterotondo Scalo, Italy; Dipartimento di Bioscienze e Territorio, Universit√† degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche, Italy (literal)
Titolo
  • Effects of combined ozone and cadmium stresses on leaf traits in two poplar clones (literal)
Abstract
  • Information on plant responses to combined stresses such as ozone (O3) and cadmium (Cd) is scarce in tree species. On the other hand, high O3 concentrations in the atmosphere and heavy metal contaminations in water and soil simultaneously affect forest ecosystems. Toxic metals may exacerbate the consequences of air pollutants. In this research, two poplar clones, differently sensitive to O3 (\"I-214\" O3- tolerant and \"Eridano\" O3-sensitive), were grown for 5 weeks in pots supplied with 0 and 150 mg Cd kg-1 soil and then exposed to a 15-day O3 fumigation (60 nl l-1, 5 h a day) or supplied with charcoal-filtered air under the same conditions (referred to as control samples). The effects of the twostressors, alone or in combination, on Cd accumulation, photosynthetic capacity, ethylene emission and oxidative state were investigated in fully expanded leaves. Cadmium accumulation in leaves caused a reduction, but not complete failure, of photosynthesis in Eridano and I-214 poplar clones. The reduction in assimilation rate was more important following O3 fumigation. Stomatal aperture after O3 treatment, instead, increased in I-214 and decreased in Eridano. Overall, Cd treatment was effective in decreasing ethylene emission, whereas O3 fumigation increased it in both clones, although interacting with the metal treatment. Again, O3 fumigation induced a significant increase in ascorbate (ASA) + dehydroascorbate (DHA) content, which was strongly oxidised by O3, thus decreasing the redox state. On the other hand, Cd treatment had a positive effect on ASA content and redox state in I-214, but not in Eridano. Although Cd and O3 are known to share some common toxicity pathways, the combined effects induced distinct clone-specific responses, underlying the complexity of plant reactions to multiple stresses. (literal)
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