靑色光이 결여된 自然光이 작물의 生長特性에 미치는 효과를 조사하고 나아가 細胞生理學 측면에서 그 효과를 검토하였다. 光質 環境을 조절하기 위해서 本연구실에서 개발한 350∼500㎚ 波長영역의 청색광을 약 70% 제거하는 plastic film(BCR film이라 命名)으로 하우스를 설치하였고, 對照區는 無色 PE film으로 설치된 하우스를 이용하였다. 태양光중 청색광이 결여된 光質의 환경은 供試品種인 고추, 오이, 호박, 상치, 토마토에서 시설 원예적인 측면으로 볼 때 두가지의 注目할 만한 효과를 나타냈다. 첫째, 對照區에 비하여 全 作期에 걸쳐 보다 왕성한 生長力을 보였으며 현저한 增收를 가져왔다. 둘째, 低溫處理에 의한 냉해 發現 정도를 비교한 결과 耐寒 能力이 상당히 향상되었음을 관찰할 수 있었다. 이러한 효과는 세포內 小器官의 生理的 活性에 反映되어 있었다. 즉 BCR film下에서 자란 작물잎의 葉綠體는 白色光 對照區의 그것에 비하여 光合成전자전달계의 활성이 월등히 향상되었으며, 미토콘드리아의 呼吸전자전달계가 정상적인 활성을 유지하는 온도의 下限點이 對照區의 그것에 비하여 數℃ 하강되었다.

The blue-light effect on the grown as well as on the physiological activity of some major horticultural plants in Korea has been investigated. The light quality used for the work was obtained from sunlight filtered by an orange-colored polyethylene film which removed about 70% of visible light in the spectral region of 350㎚∼500㎚. The film was developed in this laboratory especially for the work and named BCR film meaning blue color-removing film. The light environment in the plastic house which was built with BCR film provided plants with the blue color-deficient sunlight. Thus, the photobiological effect of blue light could be examined conversely by comparing with the effect of white sunlight in a conventional plastic house built with colorless polyethylene film. In a sense of applicability to horticulture, two remarkable effects of the blue color-deficient sunlight on plant physiology were observed: First, it enhanced to a great extent the growth activity of plants-pepper, cucumber, zucchini, tomato, and leaf lettuce-at the vegetative stage as well as at the reproductive stage, as demonstrated by their yield which were in average 40∼50% increased compared with the control (under white sunlight). Second, it improved significantly the cold tolerance of plants, as exhibited with their resistance to chilling during treatment in a cold chamber maintained at a temperature which caused chilling injury to the plants of control. The visualized effects were reflected on the physiological activity of cells on organelle level. Chloroplast isolated from the plant leaves grown under BCR film showed considerably stronger photosynthetic activity, as judged by the increased electron transport rate of illuminated chloroplast, than that from leaves grown under white PE film. Mitochondria from leaves grown under BCR film maintained normal respiration activity until temperature decreased to a few degree(℃) lower than the temperature which caused respiratory inhibition to mitochondria obtained from leaves of the control.