- ミッション1 環境診断・循環機能制御
- ミッション2 太陽エネルギー変換・高度利用
- ミッション5-2 脱化石資源社会の構築（植物、バイオマス、エネルギー、材料）
Heavy reliance on the uses of nonrenewable fossil resources for the production of energy, chemicals and materials has resulted in numerous environmental and social problems. To reduce the current dependence of using fossil resources and develop a more sustainable society, biorefineries that utilize plant biomass as a renewable raw material have been pursed.
Among the currently available biomass resources, grasses have drawn a lot of attention due to their high biomass productivity and usability. Meanwhile, lignin in plant cell walls has been viewed as a major obstacle for polysaccharide-oriented utilizations, while showing potential as a sustainable source of aromatic chemicals. In this study, using rice as a model for grasses, new strategies are proposed to bioengineer cell wall lignin to optimize the biomass utilization properties for biorefining applications.
On the other hand, plants are also a rich source of various phytochemicals, including flavonoids and stilbenoids. These bioactive phytochemicals are important for plant physiology and are valued for their health-promoting properties when consumed. However, some phytochemicals are of scarce occurrence, limiting their accessibility. To improve plant performance towards stresses as well as provide a sustainable source for obtaining beneficial chemicals, this study also pursues new bioengineering approaches to enhance the accumulation of bioactive flavonoid- and stilbenoid-type phytochemicals in grass biomass crops.
Overall, this study aims to contribute to achieve the core missions of RISH; establishment of a sustainable society with reduced dependence on fossil resources through improving the production of bioenergy and biomaterials from plant biomass (Missions 5-2, 2 and 1).