들깨 水原 8號(Perilla frutescens Suwon No. 8)에 SO₂를 接觸시켰을 때 일어나는 光合成色素의 變化에 對한 SO₂濃度, 接觸時間, 光, 活性酸素와 無機 SO₃^(-2)ion의 影響을 觀察分析한 結果는 다음과 같다. 1. SO₂濃度가 높아지고 接觸時間이 길어질수록 被害가 심해저 葉綠素의 破壞도 많았다. 2. SO₂ gas접촉에 의하여 葉綠素a가 葉綠素b 보다 쉽게 分解되었으며 또한 carotinoid도 葉綠素b보다 쉽게 分解되는 것으로 추정된다. 3. 들깨의 SO₂에 의한 葉綠素破壞는 SO₂에 의한 直接的인 影響으로 파악되었고, 이 때에 光이 必須的으로 필요하며, 물이 光分解로 生成되는 O₂^-가 SO₂와 함께 葉綠素分解에 中心的인 역할을 하는 물질이었다.

The effects of light, active oxygen, inorganic SO₃^(-2)ion, SO₂ fumigation duration, SO₂ concentration on the degradation of photosynthetic pigments in Green perilla (Perilla frutescens Suwon No. 8) fumigated by SO₂ were investigated inside a phytotron. The results were as follows: 1. With the increase of the SO₂ dosage, visible injury and the degradation of chlorophyll increased. 2. The degradation of chlorophyll b was less than that of chlorophyll a and the carotinoid was more easily degratated than chlorophyll b. 3. The degradation of chlorophyll by SO₂ fumigation was induced directly by SO₂, itself. 4. Light is necessary to the degradation of chlorophyll. SO₂ and O₂^- made in the photolysis process of the water molecule were the major components in the degradation of chlorophyll.