Abstract
It is already known that hypocotyl elongation of Arabidopsis thaliana is controlled by gibberellins (GA) and light through phytocrome (red/far red) and cryptochrome (blue light) response. However, effects of other monochromatic lights, especially yellow light, are still unclear. In this study, Arabidopsis thaliana seedlings were cultured on media added GA and/or uniconazole under different monochromatic lights or dark condition. On the medium added only GA, hypocotyl growth was strongly suppressed by blue light compared with other lights. Hypocotyl growth under yellow light was almost equal that under dark. However, yellow light was most promotive on hypocotyl elongation among tested monochromatic lights, on the media added both of GA and uniconazole. These results suggested that the responsiveness of hypocotyl to GA changed depending on light quality. Now, using a mutant lacking of GA synthesis enzyme, the responsiveness to GA is going to examine under different monochromatic lights.
