Abstract: Effects of blue light on the growth of rice seedlings were studied. Blue light suppressed the height of rice seedlings with increase of irradiance, and the first leaves of seedlings treated with blue light unfolded earlier than those of seedlings treated with white light and dark. Blue light treatment decreased the area of the first leaf but increased its leaf angle. Treated by blue light, rice seedlings had well-developed root systems with increased dehydrogenase activity, and IAA oxidase activity in leaves also being increased. After being transplanted and grown under natural conditions, rice seedlings treated by blue light developed much more tillers than those treated by white light.

Key words: Blue light, Growth, IAA oxidase, Photomorphogenesis

关键词: 蓝光, 生长, 水稻, 吲哚乙酸氧化酶, 光形态建成