Antioxidant defences and oxidative damage in salt-treated olive plants under contrasting sunlight irradiance (Articolo in rivista)

Type
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  • Antioxidant defences and oxidative damage in salt-treated olive plants under contrasting sunlight irradiance (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1093/treephys/tpp047 (literal)
Alternative label
  • Melgar J.C., Guidi L., Remorini D., Agati G., Degl'Innocenti E., Castelli S., Baratto M.C., Faraloni C., Tattini M. (2009)
    Antioxidant defences and oxidative damage in salt-treated olive plants under contrasting sunlight irradiance
    in Tree physiology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Melgar J.C., Guidi L., Remorini D., Agati G., Degl'Innocenti E., Castelli S., Baratto M.C., Faraloni C., Tattini M. (literal)
Pagina inizio
  • 1187 (literal)
Pagina fine
  • 1198 (literal)
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  • 29 (literal)
Rivista
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  • in press (literal)
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  • Pubblicazione scientifica riguardante gli effetti dell’interazione, stress salino e radiazione solare, sulla fisiologia e sulla biochimica di Olea europea. (literal)
Note
  • PuMa (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Melgar J.C.: Departamento de Agronomia, Universidad de Córdoba, Edificio ‘Celestino Mutis’, Campus Universitario de Rabanales, 14071, Córdoba, Spain; Guidi L.: Dipartimento di Difesa e Coltivazione delle Specie Legnose ‘G. Scaramuzzi’, Università di Pisa, I-56124, Pisa, Italy; Remorini D.: Dipartimento di Chimica e Biotecnologie Agrarie, Università di Pisa, I-56124, Pisa, Italy; Agati G.: IFAC, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019, Sesto F.no, Firenze, Italy; Degl'Innocenti E.: Dipartimento di Difesa e Coltivazione delle Specie Legnose ‘G. Scaramuzzi’, Università di Pisa, I-56124, Pisa, Italy; Castelli S.: IBBA, Consiglio Nazionale delle Ricerche, Via Bassini 15, I-20100, Milano, Italy; Baratto M.C.: Dipartimento di Chimica, Università di Siena, Via A. Moro 2, I-53100, Siena, Italy; Faraloni C.: ISE, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019, Sesto F.no, Firenze, Italy. (literal)
Titolo
  • Antioxidant defences and oxidative damage in salt-treated olive plants under contrasting sunlight irradiance (literal)
Abstract
  • The interactive effects of root-zone salinity and sunlight on leaf biochemistry, with special emphasis to antioxidant defences, were analysed in Olea europaea, during the summer period. Plants were grown outside under 15% (shade plants) or 100% sunlight (sun plants) and supplied with 0 or 125 mM NaCl. Measurements were conducted of 1) the contribution of ions and soluble carbohydrates to osmotic potentials 2) the PSII photochemistry and the photosynthetic pigment concentration 3) the concentration and the tissue-specific distribution of leaf flavonoids 4) the activity of antioxidant enzymes 5) the leaf oxidative damage. The concentrations of Na+ and Cl- were significantly greater in sun than in shade leaves, as also observed for the concentration of the “antioxidant” sugar-alcohol mannitol. The de-epoxidation state of violaxanthin-cycle pigments increased in response to salinity stress in sun leaves: This finding agrees with a greater maximal PSII photochemistry (Fv/Fm) at midday detected in salt-treated than in control plants. By contrast, salt-treated plants in the shade suffered from midday depression in Fv/Fm to a greater degree than observed in control plants. The high concentration of violaxanthin-cycle pigments in sun leaves, suggests that zeaxanthin may protect the chloroplast from photo-oxidative damage, rather than dissipating excess excitation energy via non photochemical quenching. Dihydroxy B-ring substituted flavonoid glycosides accumulate greatly in the mesophyll, not only in the epidermal cells, in response to high sunlight. The activity of antioxidant enzymes varied little because of sunlight irradiance, but declined sharply in response to high salinity in shade leaves. Interestingly, control and particularly salt-treated plants in the shade underwent greater oxidative damages than their sunny counterparts. These findings, which conform to the evolution of O. europaea in sunny environments, suggest that under partial shading, the antioxidant defence system may be ineffective to counter salt-induced oxidative damage. (literal)
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