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Plant and Cell Physiology Advance Access published online on August 12, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn117
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Study of AtSUS2 localization in seeds reveals a strong association with plastids

Juan Gabriel Angeles Núñez, Jocelyne Kronenberger, Sylvie Wuillème, Loïc Lepiniec and Christine Rochat*

INRA, Seed Biology Laboratory, UMR 204, INRA-AgroParisTech, Institut Jean-Pierre Bourgin, INRA, RD10, 78026 Versailles Cedex, France.

*Corresponding author: Rochat Christine, INRA, Seed Biology Laboratory, UMR 204, INRA-AgroParisTech, Institut Jean-Pierre Bourgin, INRA, RD10, 78026 Versailles Cedex, France. fax 33 1 30 83 30 96; e-mail Christine.rochat{at}versailles.inra.fr


  Abstract

Sucrose synthase (SUS) is a key enzyme in sucrose metabolism. This enzyme catalyses the reversible conversion of sucrose and UDP to UDP-glucose and fructose. In the Arabidopsis SUS gene family (six members), SUS2, is strongly and specifically expressed in Arabidopsis seeds during the maturation phase. Using specific antibodies we have shown that, SUS2 is localised in the embryo, endosperm and seed coat with differential patterns. During the maturation phase, the SUS2 protein seems to be mainly co-localised with plastids in the embryo. This novel finding is discussed in relation to the role of this enzyme in storage organs.

Keywords: Arabidopsis thaliana - plastids - seeds - sucrose synthase

(Received July 4, 2008; Accepted August 9, 2008)
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