Effect of Blue Light on the Development of Chloroplasts in Rice Seedlings

Effect of blue light on the development of chloroplasts in rice (Oryza sativa L) seedlings was studied. Blue light had'a great influence on the ultrastructure and development of chloroplasts. In the greening process of etiolated rice seedlings, blue light inhibited the development of photosynthetic membrane and the accumulation of chlorophyll as compared with white light. Chloroplasts in blue-light-grown rice seedlings had lower density and aggregation of thylakoids than those grown in white light. Chlorophyll content of rice seedlings treated by blue light was lower than that of white light, but chlorophyll a / b ratio was increased. Photosynthetic rate of blue-light-grown rice seedlings was concluded that white light is better than blue light for the development of chloroplasts in rice seedlings.This gave a reasonable explanation to the phenomena reported formerly that blue light greatly inhibited the height and leaf area of rice seedlings.