Pa-102 高圧環境が植物に与える影響(第2報)ウキクサの生育に与える影響(1.資源,ポスターセッション1)

抄録

From the viewpoint of energy security, development of new energy production systems is needed to prevent exhaustion of fossil fuel. Biomass is expected to be one of the most remarkable alternative sources of energy, because biomass is the product of plant photosynthesis converting carbon dioxide to organic compounds. So far, to use the biomass effectively, it is needed to select appropriate plants which contain a lot of fuel components (e.g. starch, oil, terpenes) and investigate its combustion characteristics. Moreover, development of methods for using biomass effectively is important. The aim of this study is to investigate the effects of artificially controlled environment, especially elevated pressure, on the plant-growing speed. In this study, we designed and constructed a plant-growing chamber to control the environmental parameters. Fluorescent lamps were set up around the chamber as the light sources. By using the chamber, the photon flux density (PFD) for the plant was able to be changed from 0 to 70 μmol/m^2s. The pressure and absolute humidity were varied from 0.1 to 0.5 MPa and from 0.78 ×10^<-2> to 13 ×10^<-2> kg/kg', respectively. An aquatic plant, Spirodela polyrrhiza, was used as a test plant to evaluate its growth rate under the elevated-atmospheric pressure varying from 0.1 to 0.4 MPa. The results clearly showed that the growing rate increases up to 1.22 times under 0.2 MPa. It was suggested that photosynthesis was improved under the conditions of elevated pressure.