Journal
PHOTOSYNTHESIS RESEARCH
Volume 108, Issue 1, Pages 15-23Publisher
SPRINGER
DOI: 10.1007/s11120-011-9645-1
Keywords
Branching; The Calvin cycle; Fructose-1; 6-Bisphosphatase; Photosynthesis; Sucrose biosynthesis; Transgenic plants
Categories
Funding
- CREST, JST
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We generated transgenic tobacco plants with high levels of fructose-1,6-bisphosphatase expressing cyanobacterialfructose-1,6-/sedoheptulose-1,7-bisphosphatase in the cytosol. At ambient CO2 levels (360 ppm), growth, photosynthetic activity, and fresh weight were unchanged but the sucrose/hexose/starch ratio was slightly altered in the transgenic plants compared with wild-type plants. At elevated CO2 levels (1200 ppm), lateral shoot, leaf number, and fresh weight were significantly increased in the transgenic plants. Photosynthetic activity was also increased. Hexose accumulated in the upper leaves in the wild-type plants, while sucrose and starch accumulated in the lower leaves and lateral shoots in the transgenic plants. These findings suggest that cytosolic fructose-1,6-bisphosphatase contributes to the efficient conversion of hexose into sucrose, and that the change in carbon partitioning affects photosynthetic capacity and morphogenesis at elevated CO2 levels.
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