Document Detail


Engineering plants for elevated CO(2): a relationship between starch degradation and sugar sensing.
MedLine Citation:
PMID:  15143436     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the future, plants will have additional CO(2) for photosynthesis. However, plants do not take maximal advantage of this additional CO(2) and it has been hypothesized that end product synthesis limitations and sugar sensing mechanisms are important in regulating plant responses to increasing CO(2). Attempts to increase end product synthesis capacity by engineering increased sucrose-phosphate synthase activity have been generally, but not universally, successful. It was found that plants benefited from a two- to three-fold increase in SPS activity but a 10-fold increase did not increase yield. Despite the success in increasing yield, increasing SPS did not increase photosynthesis. However, carbon export from chloroplasts was increased during the day and reduced at night (when starch provides carbon for sucrose synthesis. We develop here a hypothesis that starch degradation is closely sensed by hexokinase because a newly discovered pathway required for starch to sucrose conversion that involves maltose is one of few metabolic pathways that requires hexokinase activity.
Authors:
T D Sharkey; M Laporte; Y Lu; S Weise; A P M Weber
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Plant biology (Stuttgart, Germany)     Volume:  6     ISSN:  1435-8603     ISO Abbreviation:  Plant Biol (Stuttg)     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-14     Completed Date:  2004-08-04     Revised Date:  2008-01-07    
Medline Journal Info:
Nlm Unique ID:  101148926     Medline TA:  Plant Biol (Stuttg)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  280-8     Citation Subset:  IM    
Affiliation:
Department of Botany, University of Wisconsin-Madison, 430 Lincoln Dr., Madison, WI 53706, USA. tsharkey@wisc.edu
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MeSH Terms
Descriptor/Qualifier:
Biological Transport / drug effects
Carbohydrate Metabolism*
Carbon Dioxide / pharmacology*
Chloroplasts / drug effects,  genetics,  metabolism
Genetic Engineering / methods
Glucosyltransferases / metabolism
Photosynthesis / drug effects,  genetics
Plant Leaves / drug effects,  genetics,  metabolism
Plants / drug effects,  genetics,  metabolism*
Starch / metabolism*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 9005-25-8/Starch; EC 2.4.1.-/Glucosyltransferases; EC 2.4.1.14/sucrose-phosphate synthase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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