Early induction of Fe-SOD gene expression is involved in tolerance to Mn toxicity in perennial ryegrass

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dc.contributor.authorRibera Fonseca, Alejandra
dc.contributor.authorInostroza Blancheteau, Claudio
dc.contributor.authorCartes, Paula
dc.contributor.authorRengel, Zed
dc.contributor.authorMora, M. L.
dc.date2013
dc.date.accessioned2021-04-30T16:47:51Z
dc.date.available2021-04-30T16:47:51Z
dc.description.abstractManganese (Mn) toxicity limits plant growth in acid soils. Although Mn toxicity induces oxidative stress, the role of superoxide dismutase (SOD, EC.1.15.1.1) isoforms in conferring Mn tolerance remains unclear. Seedlings of ryegrass cultivars Nui (Mn-sensitive) and Kingston (Mn-tolerant) were hydroponically grown at 2.4 (optimal) or 750 mu M Mn (toxic) concentration, and harvested from 2 to 48 h. Kingston showed higher shoot Mn than Nui at 2.4;mu M Mn. At toxic supply, shoot Mn concentration steadily increased in both cultivars, with Kingston having the highest accumulation at 48 h. An early (2 h) increase in lipid peroxidation under Mn excess occurred, but it returned (after 6 h) to the basal level in Kingston only. Kingston exhibited higher SOD activity than Nui, and that difference increased due to toxic Mn. In general, Mn-induced gene expression of Mn- and Cu/Zn-SOD isoforms was higher in Nui than Kingston. Nevertheless, under Mn excess, we found a greater Fe-SOD up-regulation (up to 5-fold) in Kingston compared to Nui. Thus, Fe-SOD induction in Kingston might explain, at least partly, its high tolerance to Mn toxicity. This is the first evidence that Mn toxicity causes differential gene expression of SOD isoforms in ryegrass cultivars in the short-term. (C) 2013 Published by Elsevier Masson SAS.
dc.identifier.citationPLANT PHYSIOLOGY AND BIOCHEMISTRY,Vol.73,77-82,2013
dc.identifier.doi10.1016/j.plaphy.2013.08.012
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3594
dc.language.isoen
dc.publisherELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
dc.sourcePLANT PHYSIOLOGY AND BIOCHEMISTRY
dc.subject.englishManganese toxicity
dc.subject.englishManganese tolerance
dc.subject.englishRyegrass
dc.subject.englishOxidative stress
dc.subject.englishSuperoxide dismutase isoforms
dc.subject.englishFe-SOD
dc.subject.englishGene expression
dc.titleEarly induction of Fe-SOD gene expression is involved in tolerance to Mn toxicity in perennial ryegrass
dc.typeArticle
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uct.indizacionSCI
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