DEVELOPMENT OF PRACTICAL BLUE/RED LIGHT-EMITTING DIODE LIGHT SOURCES FOR PLANT TISSUE CULTURE AND PLANT FACTORY

本研究的目的是利用蓝光（450 nm）和红光（660 nm）发光二极管（LED）作为人工光源，开发实用的植物生长或植物组织培养。任期为1995年至1997年。在这三年中，我们取得了许多宝贵的成果，我们可以为世界感到自豪。此外，我们的研究被报纸和电视新闻多次广泛报道。可以说，我们的项目非常成功。实例研究结果如下：1.我们开发了多种类型的LED植物生长室，名为LED PACK 1、2和3（LED PACK系列），以及用于生物技术实验的LED室，名为BIOLED 1和2.2。发明了一种全新的蓝、红光LED光源培养容器，用于植物生长或植物组织培养.在国际上首次成功地实现了仅使用蓝光和红光LED灯的大花蕙兰试管苗的快速繁殖.我们还开发了一个计算机控制的LED植物生长仪命名为COMPACK。使用LED PACK设备，发现关于蓝光和红光的比率的最佳光质量条件为10-30%：90-70%或通常为25%：75%。蓝光对发芽的启动没有显著影响。在研究过程中，首席研究员冈本教授发现，蓝色LED光可以用于新生儿黄疸的光疗，蓝光可以阻止蓝色霉菌的繁殖。此外，他还展示了LED光源不仅可以用作植物生长的光源，还可以用作植物生长传感器，以了解作物的生长程度。

The purpose of the research was to develop practical plant growth or plant tissue culture using blue (450nm) and red (660nm) light-emitting diodes (LEDs) as artificial light source. The term was from 1995 to 1997. During these three years, we have obtained so many valuable results which we can be proud for the world. Further, our research were widely reported by newspapers and TV news many times. It can be said that our project was very much successful. Example the results of the research are as follows ;1. We developed many types of LED plant growth chamber named LED PACK 1,2 and 3 (LED PACK series) and LED chamber for bio-technological experiments named BIOLED 1 and 2.2. We invented a completely new type of culture vessel with blue and red LEDs light source for plant growth or plant tissue culture.3. We succeeded in the micropropagation of cymbidium plantlet using only blue and red LEDs firstly in the world.4. We also developed a computer-controlled LED plant growth apparatus named COMPACK.5. Using the LED PACK apparatuses, it was found that the best light quality condition with respect to the ratio of blue light and red light is 10-30% : 90-70% or typically 25% : 75%.6. Blue light has no significant effect on the initiation of germination.In the course of the research, the head researcher, Prof.K.Okamoto found that blue LED light can be utilized for the phototherapy of neonatal jaundice and that the blue light stop the propagation of blue mold. Also, he showed that LED light source can be used not only as a light source for plant growth but also it can utilized as a plant growth sensor to know the degree of the crop.