Abstract
We have previously demonstrated that transgenic tobacco plants enhancing cytosolic fructose-1,6-bisphosphatase (FBPase) had increased lateral shoots and leaves at elevated CO2 levels. These results suggest that alteration of the sucrose partitioning affects development of shoot branching. To clarify the effect of alteration of sugar partitioning on shoot branching, we generated and evaluated transgenic Arabidopsis expressing cyanobacterial FBPase-II in cytosol (AcF). AcF plants showed the phenotypes in growth, photosynthetic activity, and fresh weight similar to the wild-type plants at ambient CO2 levels. In contrast, at elevated CO2 levels (1000 ppm), the lateral shoot, leaf number and fresh weight of AcF were increased compared with the wild-type plants. Next we found that transcript levels of various genes involved in the biosynthesis of plant hormones significantly changed in the AcF plants.
