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Organ-dependent responses of the african rice to short-term iron toxicity: Ferritin regulation and antioxidative responses

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Majerus, Valérie [UCL] Bertin, Pierre [UCL] Swenden, V. Fortemps, A. Lobreaux, S. Lutts, Stanley [UCL]

Hydroponically grown African rice (Oryza glaberrima) was exposed for 72 h to a high Fe2+ concentration (500 mg dm(-3)) to identify the first steps of iron toxicity response in various organs. Iron accumulated in all plant parts analysed and had only a limited impact on absorption and translocation of other nutrients. The content of the iron-storage protein ferritin increased as a consequence of transcription stimulation or increase in mRNA stability and culminated after 48 h of treatment in laminae and to a lesser extent in sheaths but was not detected in roots. Although endogenous iron concentrations were similar in sheaths and laminae, superoxide dismutase activity was stimulated only in sheaths while ascorbate peroxidase activity increased mainly in laminae. It is concluded that both ferritin synthesis and antioxidative response may play a key role in the resistance of Oryza glaberrima to iron toxicity but that their relative importance are not the same in all organs.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2007
Language Anglais
Journal information "Biologia Plantarum : journal for experimental botany" - Vol. 51, no. 2, p. 303-312 (2007)
Peer reviewed yes
Publisher Springer (Dordrecht)
issn 0006-3134
e-issn 1573-8264
Publication status Publié
Affiliations UCL - AGRO/BAPA - Département de biologie appliquée et des productions agricoles
UCL - SC/BIOL - Département de biologie
Keywords ascorbate ; glutathione ; malondialdehyde ; Oryza glaberrima ; oxidative stress ; superoxide dismutase
Links
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Bibliographic reference Majerus, Valérie ; Bertin, Pierre ; Swenden, V. ; Fortemps, A. ; Lobreaux, S. ; et. al. Organ-dependent responses of the african rice to short-term iron toxicity: Ferritin regulation and antioxidative responses. In: Biologia Plantarum : journal for experimental botany, Vol. 51, no. 2, p. 303-312 (2007)
Permanent URL http://hdl.handle.net/2078.1/37703