Journal Article

Enzymatic and Non-enzymatic Antioxidant Responses of Carrizo citrange, a Salt-Sensitive Citrus Rootstock, to Different Levels of Salinity

Vicent Arbona, Victor Flors, Josep Jacas, Pilar García-Agustín and Aurelio Gómez-Cadenas

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 4, pages 388-394
Published in print April 2003 | ISSN: 0032-0781
Published online April 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg059
Enzymatic and Non-enzymatic Antioxidant Responses of Carrizo citrange, a Salt-Sensitive Citrus Rootstock, to Different Levels of Salinity

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In several plant species, oxidative stress has been shown to be one of the causes of damage produced by salinity. In order to assess the implication of oxidative stress in the reported sensitivity of the citrus rootstock Carrizo citrange to salt stress, 5-month-old seedlings were grown with increasing NaCl concentrations added to the watering solution. As an indicator of oxidative damage, malondialdehyde content was measured. The antioxidant capability of the plants was determined by measuring superoxide dismutase, ascorbate peroxidase, catalase and glutathione reductase activities together with the non-enzymatic antioxidant activity. As additional physiological responses to the stress, 1-aminocyclopropane-1-carboxilic acid and proline accumulation were assessed. Data indicate that Carrizo citrange responded to salt-induced oxidative stress by increasing enzymatic and non-enzymatic antioxidant defenses proportionally to the extent of the stress imposed, and that in all plants the malondialdehyde content remained at a moderate level. We suggest that the important deleterious effects reported in Carrizo citrange grown under high NaCl concentrations are mainly due to a cellular intoxication by Cl ions and not to the salt-induced oxidative stress.

Keywords: Keywords: ACC — Antioxidant activities — Carrizo citrange — Oxidative stress — Proline — Salt stress.; Abbreviations: SOD, superoxide dismutase; APX, ascorbate peroxidase; CAT, catalase; GR, glutathione reductase; ABA, abscisic acid; MDA, malondialdehyde; ACC, 1-aminocyclopropane-1-carboxilic acid.

Journal Article.  5253 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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