The present invention relates to genetic constructs capable of manipulating fructan biosynthesis in photosynthetic cells of a plant, said genetic constructs including a promoter, or functionally active fragment or variant thereof, operatively linked to a nucleic acid encoding a bacterial FT enzyme, or a functionally active fragment or variant thereof. The present invention also relates to the modification of fructan biosynthesis in plants and, more particularly, to methods of manipulating fructan biosynthesis in photosynthetic cells. The present invention also relates to increasing plant biomass and, more particularly, to methods of enhancing biomass yield and/or yield stability, including shoot and/or root growth in a plant. The present invention also relates to methods of enhancing the productivity of biochemical pathways.
