カーネーションの花色発現に関する研究 (第2報)

Abstract

In order to make clear the effect of light quantity on anthocyanin formation of carnation flowers, some experiments using detached petals just before pigmentation were conducted under various conditions of artificial light. The detached petals were cultured in medium of glass wool soaked with 4% sucrose solution.Both growth and anthocyanin content of the cultured petals reached to peak on 16 to 20 days after the beginning of culture.Efficiency of the anthocyanin formation per radiant energy during the culture increased as the petal grows and reached maximum in the petals of about 12th day after the beginning of culture.The width of petals and the amount of anthocyanins increased with the increase of either light intensity or light duration, but the growth of petals in width was remarkable at lower intensity.The saturation .of anthocyanin formation was attained at the irradiation of about 8, 000 lux in light intensity.In the case of irradiation in which total amount of radiant energy as adjusted to be equal, the combination of low intensity and long duration resulted higher value in the anthocyanin formation than that of inverse condition, and short cyclic irradiation was more effective in the anthocyanin formation than long cyclic irradiation.