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JXB Advance Access originally published online on March 26, 2009
Journal of Experimental Botany 2009 60(10):2923-2931; doi:10.1093/jxb/erp066
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

This article appears in the following Journal of Experimental Botany issue: Special Issue: Crop Science for a Changing Climate and Plant Biomass for Food and Energy [View the issue table of contents]

REVIEW-ARTICLE

Changing sugar partitioning in FBPase-manipulated plants

Antonio Jesús Serrato1, Juan de Dios Barajas-López2, Ana Chueca1 and Mariam Sahrawy1,*

1Department of Plant Molecular and Cell Biology, Estación Experimental del Zaidín (CSIC), Profesor Albareda, 1, E-18008 Granada, Spain
2Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, S-901 87 Umeå, Sweden

* To whom correspondence should be addressed: E-mail: mariam.sahrawy{at}eez.csic.es

This review offers an overview of the current state of our knowledge concerning the role of fructose-1,6-bisphosphatase (FBPase) in sugar partitioning and biosynthesis, through the analysis of genetically manipulated plants. The existence of two well-characterized isoforms is a consequence of the subcellular compartmentalization of photosynthetic eukaryotes, conditioning their respective regulatory mechanisms and their influence over plant metabolism and photosynthesis. Both isoforms are important, as has been deduced from previous work with different plant species, although there is still much to be done in order to gain a definitive vision of this issue. Despite that, alteration of the FBPase content follows a general pattern, there are some differences that could be considered species-specific. Modifications lead to profound changes in the carbohydrate content and carbon allocation, raising questions as to whether flux of some sugars or sugar precursors from one side to the other of the chloroplast envelope occurs to rebalance carbohydrate metabolism or whether other compensatory, though not fully efficient, enzymatic activities come into play. Due to the pleiotropic nature of modifying the core carbon metabolism, an answer to the above questions would require an exhaustive study involving diverse aspects of plant physiology.

Key words: Calvin cycle, carbon partitioning, fructose-1,6-bisphosphatase, genetic engineering, starch, sucrose, thioredoxin

Received 17 December 2008; Revised 13 February 2009 Accepted 17 February 2009


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