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JXB Advance Access originally published online on June 27, 2005
Journal of Experimental Botany 2005 56(418):2153-2161; doi:10.1093/jxb/eri215
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org

RESEARCH PAPER

Physiological characterization of Mg deficiency in Arabidopsis thaliana

Christian Hermans1,2 *,{dagger} and Nathalie Verbruggen1

1Laboratoire de Physiologie et de Génétique Moléculaire des Plantes, Université Libre de Bruxelles, Bd du Triomphe CP 242, 1050 Brussels, Belgium
2Bioenergetics Laboratory, University of Geneva, Ch des Embrouchis, Geneva 1254, Switzerland

{dagger} To whom correspondence should be addressed in Brussels. Fax: +32 2 6505412. E-mail: chermans{at}ulb.ac.be

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.

Key words: Arabidopsis, Cab2, chloropyll a fast fluorescence transient, magnesium deficiency, photosynthesis, sugars


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