title: Overexpression of a cyanobacterial fructose-1,6-/sedoheptulose-1,7-bisphosphatase in tobacco enhances photosynthesis and growth.
abstract: Transgenic tobacco plants expressing a cyanobacterial fructose-1,6/sedoheptulose-1,7-bisphosphatase targeted to chloroplasts show enhanced photosynthetic efficiency and growth characteristics under atmospheric conditions (360 p.p.m. CO2). Compared with wild-type tobacco, final dry matter and photosynthetic CO2 fixation of the transgenic plants were 1.5-fold and 1.24-fold higher, respectively. Transgenic tobacco also showed a 1.2-fold increase in initial activity of ribulose 1,5 bisphosphate carboxylase/oxygenase (Rubisco) compared with wild-type plants. Levels of intermediates in the Calvin cycle and the accumulation of carbohydrates were also higher than those in wild-type plants. This is the first report in which expression of a single plastid-targeted enzyme has been shown to improve carbon fixation and growth in transgenic plants.
authors.affiliation: Graduate School of Advanced Life Science, Kinki University, Nakamachi, Nara 631-8505, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Miyagawa
authors.forename: M
authors.initials: M
authors.lastname: Tamoi
authors.forename: S
authors.initials: S
authors.lastname: Shigeoka
mesh_terms: D002244:Carbon / Q000378:metabolism; D002736:Chloroplasts / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D000458:Cyanobacteria / Q000201:enzymology* / Q000235:genetics; D006597:Fructose-Bisphosphatase / Q000235:genetics* / Q000378:metabolism; D005634:Fructose-Bisphosphate Aldolase / Q000378:metabolism; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000378:metabolism; D010766:Phosphorylation; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000378:metabolism; D010788:Photosynthesis; D018515:Plant Leaves / Q000378:metabolism; D030821:Plants, Genetically Modified; D010947:Plants, Toxic; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism; D013403:Sugar Phosphates / Q000235:genetics* / Q000378:metabolism; D014026:Nicotiana / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism
chemical_list: D013403:Sugar Phosphates; D002244:Carbon; C022079:sedoheptulose 1,7-bisphosphate; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; D017853:Phosphotransferases (Alcohol Group Acceptor); C022390:phosphoribulokinase; D006597:Fructose-Bisphosphatase; D012273:Ribulose-Bisphosphate Carboxylase; D005634:Fructose-Bisphosphate Aldolase