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Plant and Cell Physiology Advance Access originally published online on August 12, 2008
Plant and Cell Physiology 2008 49(10):1621-1626; 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 email: journals.permissions@oxfordjournals.org

Short Communication

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: E-mail, Christine.rochat{at}versailles.inra.fr; Fax, +33-1-30-83-30-96.


  Abstract

Sucrose synthase (SUS) is a key enzyme in sucrose metabolism. This enzyme catalyzes 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 localized in the embryo, endosperm and seed coat with differential patterns. During the maturation phase, the SUS2 protein seems to be mainly co-localized 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

Abbreviations: DAF, days after flowering; SUS, sucrose synthase

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