Document Detail

Overexpression of C(4)-cycle enzymes in transgenic C(3) plants: a biotechnological approach to improve C(3)-photosynthesis.
MedLine Citation:
PMID:  11886879     Owner:  NLM     Status:  MEDLINE    
The process of photorespiration diminishes the efficiency of CO(2) assimilation and yield of C(3)-crops such as wheat, rice, soybean or potato, which are important for feeding the growing world population. Photorespiration starts with the competitive inhibition of CO(2) fixation by O(2) at the active site of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and can result in a loss of up to 50% of the CO(2) fixed in ambient air. By contrast, C(4) plants, such as maize, sugar cane and Sorghum, possess a CO(2) concentrating mechanism, by which atmospheric CO(2) is bound to C(4)-carbon compounds and shuttled from the mesophyll cells where the prefixation of bicarbonate occurs via phosphoenolpyruvate carboxylase (PEPC) into the gas-tight bundle-sheath cells, where the bound carbon is released again as CO(2) and enters the Calvin cycle. However, the anatomical division into mesophyll and bundle-sheaths cells ("Kranz"-anatomy) appears not to be a prerequisite for the operation of a CO(2) concentrating mechanism. Submerged aquatic macrophytes, for instance, can induce a C(4)-like CO(2) concentrating mechanism in only one cell type when CO(2) becomes limiting. A single cell C(4)-mechanism has also been reported recently for a terrestrial chenopod. For over 10 years researchers in laboratories around the world have attempted to improve photosynthesis and crop yield by introducing a single cell C(4)-cycle in C(3) plants by a transgenic approach. In the meantime, there has been substantial progress in overexpressing the key enzymes of the C(4) cycle in rice, potato, and tobacco. In this review there will be a focus on biochemical and physiological consequences of the overexpression of C(4)-cycle genes in C(3) plants. Bearing in mind that C(4)-cycle enzymes are also present in C(3) plants, the pitfalls encountered when C(3) metabolism is perturbed by the overexpression of individual C(4) genes will also be discussed.
Rainer E Häusler; Heinz-Josef Hirsch; Fritz Kreuzaler; Christoph Peterhänsel
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of experimental botany     Volume:  53     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-03-11     Completed Date:  2002-05-23     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  591-607     Citation Subset:  IM    
Botanik II, Botanisches Institut der Universität zu Köln, Gyrhofstrasse 15, D-50931 Cologne, Germany.
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MeSH Terms
Carbon Dioxide / metabolism
Carbonic Anhydrases / metabolism
Enzymes / genetics*,  metabolism
Gene Expression Regulation, Enzymologic
Gene Expression Regulation, Plant
Malate Dehydrogenase / genetics,  metabolism
Oxygen / metabolism
Phosphoenolpyruvate Carboxylase / genetics,  metabolism
Photosynthesis / genetics*,  physiology
Photosynthetic Reaction Center Complex Proteins / genetics,  metabolism
Plant Proteins / genetics,  metabolism
Plants / classification,  genetics*,  metabolism
Plants, Genetically Modified
Protein-Serine-Threonine Kinases / genetics,  metabolism
Pyruvate, Orthophosphate Dikinase*
Ribulose-Bisphosphate Carboxylase / genetics,  metabolism
Reg. No./Substance:
0/Enzymes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Plant Proteins; 124-38-9/Carbon Dioxide; 7782-44-7/Oxygen; EC Dehydrogenase; EC dehydrogenase-(oxaloacetate-decarboxylating) (NAD+); EC dehydrogenase (oxaloacetate-decarboxylating) (NADP+); EC 2.7.1.-/phosphoenolpyruvate carboxylase kinase; EC Kinases; EC protein, Zea mays; EC, Orthophosphate Dikinase; EC Carboxylase; EC Carboxylase; EC Anhydrases

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