Fulltext

Physiological characterization of Mg deficiency in Arabidopsis thaliana

Hermans, Christian ; Verbruggen, Nathalie

In: Journal of Experimental Botany, 2005, vol. 56, no. 418, p. 2153-2161

Ajouter à la liste personnelle
    Titre
    • Physiological characterization of Mg deficiency in Arabidopsis thaliana
    Auteur
    • Hermans, Christian. Laboratoire de Physiologie et de Génétique Moléculaire des Plantes, Université Libre de Bruxelles, Bd du Triomphe CP 242, 1050 Brussels, Belgium
    • Verbruggen, Nathalie. Laboratoire de Physiologie et de Génétique Moléculaire des Plantes, Université Libre de Bruxelles, Bd du Triomphe CP 242, 1050 Brussels, Belgium
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Experimental Botany, 2005, vol. 56, no. 418, p. 2153-2161. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:297168
    Summary
    Although the symptoms of magnesium deficiency are well documented in plants, the primary physiological effects of low Mg availability remain largely unknown. This paper describes the physiological responses of Mg starvation in Arabidopsis thaliana. Growth characteristics, Mg and sugar concentration, and photochemical performance were measured at regular intervals during the induction of Mg deficiency. These data show that Mg deficiency increased the sugar concentration and altered sucrose export from young source leaves before any noticeable effect on photosynthetic activity was seen. The decline in photosynthetic activity might be elicited by increased leaf sugar concentrations. Transcript levels of Cab2 (encoding a chlorophyll a/b protein) were lower in Mg-deficient plants before any obvious decrease in the chlorophyll concentration. These transcriptional data suggest that the reduction of chlorophyll is a response to sugar levels, rather than a lack of Mg atoms for chelating chlorophyll