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Multigene manipulation of photosynthetic carbon assimilation increases CO<inf>2</inf> fixation and biomass yield in tobacco

Simkin, AJ and McAusland, L and Headland, LR and Lawson, T and Raines, CA (2015) 'Multigene manipulation of photosynthetic carbon assimilation increases CO<inf>2</inf> fixation and biomass yield in tobacco.' Journal of Experimental Botany, 66 (13). 4075 - 4090. ISSN 0022-0957

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© 2015 The Author 2015. Published by Oxford University Press on behalf of the Society for Experimental Biology. Over the next 40 years it has been estimated that a 50% increase in the yield of grain crops such as wheat and rice will be required to meet the food and fuel demands of the increasing world population. Transgenic tobacco plants have been generated with altered combinations of sedoheptulose-1,7-bisphosphatase, fructose-1,6-bisphosphate aldolase, and the cyanobacterial putative-inorganic carbon transporter B, ictB, of which have all been identified as targets to improve photosynthesis based on empirical studies. It is shown here that increasing the levels of the three proteins individually significantly increases the rate of photosynthetic carbon assimilation, leaf area, and biomass yield. Furthermore, the daily integrated measurements of photosynthesis showed that mature plants fixed between 12-19% more CO<inf>2</inf> than the equivalent wild-type plants. Further enhancement of photosynthesis and yield was observed when sedoheptulose-1,7-bisphosphatase, fructose-1,6-bisphosphate aldolase, and ictB were over-expressed together in the same plant. These results demonstrate the potential for the manipulation of photosynthesis, using multigene-stacking approaches, to increase crop yields.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Humanities > International Academy
Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 18 May 2015 14:34
Last Modified: 23 Jan 2019 00:18

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