The presence of Psidium guajava in polluted environments has been reported in recent studies, suggesting that this species has a high tolerance to the metal stress. The present study aims at a physiological characterization of P. guajava response to high nickel (Ni) concentrations in the root-zone. Three hydroponic experiments were carried out to characterize the effects of toxic Ni concentrations on morphological and physiological parameters of P. guajava, focusing on Ni-induced damages at the root-level and root ion fluxes. With up to 300μM NiSO4 in the root-zone, plant growth was similar to that in control plants, whereas at concentrations higher than 1000μM NiSO4 there was a progressive decline in plant growth and leaf gas exchange parameters; this occurred despite, at all considered concentrations, plants limited Ni2+ translocation to the shoot, therefore avoiding shoot Ni2+ toxicity symptoms. Maintenance of plant growth with 300μM Ni2+ was associated with the ability to retain K+ in the roots meanwhile 1000 and 3000μM NiSO4 led to substantial K+ losses. In this study, root responses mirror all plant performances suggesting a direct link between root functionality and Ni2+ tolerance mechanisms and plant survival. Considering that Ni was mainly accumulated in the root system, the potential use of P. guajava for Ni2+ phytoextraction in metal-polluted soils is limited; nevertheless, the observed physiological changes indicate a good Ni2+ tolerance up to 300μM NiSO4 suggesting a potential role for the phytostabilization of polluted soils.

Root based responses account for Psidium guajava survival at high nickel concentration / Nadia Bazihizina; Mirvat Redwan; Cosimo Taiti; Cristiana Giordano; Emanuela Monetti; Elisa Masi; Elisa Azzarello; Stefano Mancuso. - In: JOURNAL OF PLANT PHYSIOLOGY. - ISSN 0176-1617. - STAMPA. - 174:(2015), pp. 137-146. [10.1016/j.jplph.2014.10.011]

Root based responses account for Psidium guajava survival at high nickel concentration

BAZIHIZINA, NADIA;REDWAN, MIRVAT;TAITI, COSIMO;MONETTI, EMANUELA;MASI, ELISA;AZZARELLO, ELISA;MANCUSO, STEFANO
2015

Abstract

The presence of Psidium guajava in polluted environments has been reported in recent studies, suggesting that this species has a high tolerance to the metal stress. The present study aims at a physiological characterization of P. guajava response to high nickel (Ni) concentrations in the root-zone. Three hydroponic experiments were carried out to characterize the effects of toxic Ni concentrations on morphological and physiological parameters of P. guajava, focusing on Ni-induced damages at the root-level and root ion fluxes. With up to 300μM NiSO4 in the root-zone, plant growth was similar to that in control plants, whereas at concentrations higher than 1000μM NiSO4 there was a progressive decline in plant growth and leaf gas exchange parameters; this occurred despite, at all considered concentrations, plants limited Ni2+ translocation to the shoot, therefore avoiding shoot Ni2+ toxicity symptoms. Maintenance of plant growth with 300μM Ni2+ was associated with the ability to retain K+ in the roots meanwhile 1000 and 3000μM NiSO4 led to substantial K+ losses. In this study, root responses mirror all plant performances suggesting a direct link between root functionality and Ni2+ tolerance mechanisms and plant survival. Considering that Ni was mainly accumulated in the root system, the potential use of P. guajava for Ni2+ phytoextraction in metal-polluted soils is limited; nevertheless, the observed physiological changes indicate a good Ni2+ tolerance up to 300μM NiSO4 suggesting a potential role for the phytostabilization of polluted soils.
2015
174
137
146
Nadia Bazihizina; Mirvat Redwan; Cosimo Taiti; Cristiana Giordano; Emanuela Monetti; Elisa Masi; Elisa Azzarello; Stefano Mancuso
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/956822
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