http://www.cnr.it/ontology/cnr/individuo/prodotto/ID56460

Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea (Articolo in rivista) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

Alternative label

Remorini D., Melgar J.C., Guidi L., Degl'lnnocenti E., Castelli S., Traversi M.L., Massai R., Tattini M. (2009)
Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea
in Environmental and experimental botany
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Remorini D., Melgar J.C., Guidi L., Degl'lnnocenti E., Castelli S., Traversi M.L., Massai R., Tattini M. (literal)

Pagina inizio

210 (literal)

Pagina fine

219 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

65, 2 (literal)

Rivista

Environmental and experimental botany (Rivista)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Remorini D.: Univ Pisa, Dipartimento Difesa & Coltivaz Specie Legnose G S, I-56124 Pisa, Italy; Melgar J.C.: Univ Cordoba, Dept Agron, Cordoba 14071, Spain; Guidi L., Degl'lnnocenti E.: Univ Pisa, Dipartimento Chim & Biotecnol Agrarie, I-56124 Pisa, Italy; Castelli S.: CNR, Ist Biol & Biotecnol Agrarie, I-20100 Milan, Italy (literal)

Titolo

Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea (literal)

Abstract

Root-zone salinity stress and high solar irradiance concomitantly occurs in the Mediterranean basin, where Olea europaea is the dominating fruit-tree crop-species. Although the effect of each individual stressor on plant performance has been widely investigated, much less is known on the interaction effects of salinity stress and solar irradiance on the physiology and biochemistry of olive plants. Here we analyzed how changes in root-zone NaCl concentration and sunlight radiation affect relevant physiological and biochemical features in olive cv. Cipressino. Two-year-old plants were supplied with 0 or 125 mM NaCl and exposed to 15% (shade) or 100% sunlight (sun) over a 5-week period, starting from July 10th, 2005. Measurements were conducted of (i) gas exchange and plant growth, (ii) the concentrations of cations and chloride, (iii) the concentrations of soluble carbohydrates, violaxanthin-cycle pigments and polyphenols, and (iv) the protein oxidation and the lipid peroxidation in the leaves. Salt-induced reductions in gas exchange performance and plant growth were greater at the sun than at the shade site, mostly due to light-induced changes in leaf water relations and vapour pressure deficit (vpd), rather than in the concentration of potentially toxic ions. Light-induced increases in leaf Na+ and Cl- concentrations were countered by parallel enhancements in the concentrations of K+ and Ca2+. Sun leaves had sharply greater concentrations of mannitol and xanthophylls, irrespective of root-zone salinity. The amount of \"newly assimilate carbon\" allocated to polyphenols, especially to flavonoids, increased in response to salinity stress and high sunlight. Remarkably. the protein oxidation was greater in shade than in sun leaves of well-watered plants, and increased more at the shade than at the sun site because of high salinity. We suggest that heat-stress (on average maximum T exceeded 33 degrees C for 50% of the experimental period), which acted in concert with salinity stress and sunlight irradiance in determining plant responses in our experiment, was responsible for leaf oxidative damage in plants growing under contrasting solar radiation. Indeed, sun leaves of salt-stressed plants were equipped with an extraordinary-rich arsenal of antioxidant compounds, distributed in different cell compartments, i.e., mannitol, zeaxanthin and flavonoids, which likely countered effectively the oxidative damage driven by heat-stress, a clear example of cross-tolerance. (C) 2008 Elsevier B.V. All rights reserved. (literal)

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