$SO_2$가 느타리버섯의 자실체생장(生長)과 갓색에 미치는 영향(影響)을 구명(究明)하기 위하여 $SO_2$의 농도(濃度)를 0.625, 1.25, 2.5 및 5 ppm으로 조절(調節)하고 노출시간을 15, 30, 60, 120 및 180분(分)으로 하여 실험(實驗)한 결과(結果)는 다음과 같다. 1. 느타리버섯의 자실체(子實體)에 $SO_2$를 처리하면 갓색이 변화(變化)하였는데 낮은 처리수준(處理水準)에서는 회청색(灰靑色)을 띄었고 처리수준(處理水準)이 높아질수록 담갈색(淡褐色), 암갈색(暗褐色)으로 변색(變色)이 심하여 졌다. 2. 자실체(子實體) 변색(變色)의 한계점(限界點)은 0.625 ppm 120분(分), 1.25 ppm 30분(分), 2.5 ppm 15분(分)이었고 5 ppm에서는 10분(分) 이내(以內)에 변색(變色)하였다. 3. $SO_2$를 1.25 ppm 120분이상(分以上), 2.5 ppm 60분이상(分以上), 5 ppm 30분이상(分以上) 처리(處理)하면 자실체(子實體)의 생장(生長)이 억제(抑制)되었다. 2.5 ppm, 180분(分), 5 ppm 60분(分)에서는 자실체(子實體)가 고사(枯死)하였다. 4. $SO_2$의 처리(處理)는 담자기(擔子器)의 발육(發育)과 포자형성(胞子形成)을 심하게 억제(抑制)하였고 형성(形成)된 포자(胞子)의 $20{sim}25%$는 기형화(畸形化)하였다. 5. $SO_2$를 처리(處理)한 자실체(子實體)에서 ethylene 발생(發生)은 검출되지 않았다.
Oyster mushroom, Pleurotus ostreatus, was exposed to 0.625, 1.25, 2.5 and 5.0 ppm $SO_2$ for 15, 30, 60, 120 and 180 minutes at the tiny button stage in order to study the effect of sulfur dioxide on growth and cap discoloration of the mushroom. The cap color was changed from grey to greyish blue at low dosage of sulfur dioxide, and with the lapse of exposing time and rasing sulfur dioxide concentration up, the color was changed to light brown and dark brown. The cap dicoloration was begun by the exposure of sulfur dioxide to 0.625 ppm for 120 minutes, to 1.25 ppm for 30 minutes and to 2.5 ppm for 15 minutes. By the exposure of sulfur dioxide to 1.25 ppm for 120 minutes, to 2.5 ppm for 30 minutes, its growth was inhibited, but the fruit body was died by the exposure of the gas to 2.5 ppm for 180 minutes and to 5.0 ppm for 60 minutes. Sulfur dioxide inhibited conspicuously the development of basidia and basidiospores of the mushroom and 20 to 25 percent of basidiospores formed were abnormal. Ethylene production by mushroom exposed to sulfur dioxide was not recognized.
