Abstract
The strategy to enhance CO2 fixation is to increase the biological deposition of cellulose in forest trees, because cellulose which is the most abundant organic compound on the earth is made from CO2 through photosynthetic pathways in the walls of plant cells. Since xyloglucans contribute to the cross-linking of cellulose microfibril networks in the walls growing plant cells, the primary growth could be promoted by the wall modification involved in xyloglucan degradation. The degradation may cause the weakening of the wall which allows it to stretch, and subsequent turgor-driven wall expansion. Sucrose synthase (SuSy) is believed to be involved in cellulose biosynthesis by channeling UDP-glucose to cellulose synthase for secondary wall synthesis. It should be possible to produce transgenic forest trees in which cellulose deposition is enhanced by the overexpression of sucrose synthase.
