AOBPreview originally published online on February 7, 2006
Annals of Botany 2006 97(4):479-495; doi:10.1093/aob/mcl006
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INVITED REVIEW |
Regulation of Sulfate Assimilation in Arabidopsis and Beyond
John Innes Centre, Norwich NR4 7UH, UK
* For correspondence. E-mail stanislav.kopriva{at}bbsrc.ac.uk
Received: 10 October 2005 Returned for revision: 11 November 2005 Accepted: 23 November 2005 Published electronically: 7 February 2006
Background and Aims Sulfate assimilation is a pathway used by prokaryotes, fungi and photosynthetic organisms to convert inorganic sulfate to sulfide, which is further incorporated into carbon skeletons of amino acids to form cysteine or homocysteine. The pathway is highly regulated in a demand-driven manner; however, this regulation is not necessarily identical in various plant species. Therefore, our knowledge of the regulation of sulfate assimilation is reviewed here in detail with emphasis on different plant species.
Scope Although demand-driven control plays an essential role in regulation of sulfate assimilation in all plants, the molecular mechanisms of the regulation and the effects of various treatments on the individual enzymes and metabolites are often different. This review summarizes (1) the molecular regulation of sulfate assimilation in Arabidopsis thaliana, especially recent data derived from platform technologies and functional genomics, (2) the co-ordination of sulfate, nitrate and carbon assimilations in Lemna minor, (3) the role of sulfate assimilation and glutathione in plantRhizobia symbiosis, (4) the cell-specific distribution of sulfate reduction and glutathione synthesis in C4 plants, (5) the regulation of glutathione biosynthesis in poplar, (6) the knock-out of the adenosine 5'phosphosulfate reductase gene in Physcomitrella patens and identification of 3'-phosphoadenosyl 5'-phosphosulfate reductase in plants, and (7) the sulfur sensing mechanism in green algae.
Conclusions As the molecular mechanisms of regulation of the sulfate assimilation pathway are not known, the role of Arabidopsis as a model plant will be further strengthened. However, this review demonstrates that investigations of other plant species will still be necessary to address specific questions of regulation of sulfur nutrition.
Key words: Sulfate assimilation, plant nutrition, glutathione, cysteine, C4 photosynthesis, Arabidopsis thaliana, Physcomitrella patens, poplar, Lemna minor
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