Effect of Predisposing Temperatures on The Histopathology of the The Rice Blast Fungus, Pyricularia oryzae II. Effect of Four Predisposing Temperature Regimes on The Symptom Development

접종전 온도처리가 벼도열병균의 조직병리학에 미치는 영향 II. 도열병 병반발현에 미치는 접종전 처리온도의 영향

In the present study, it was found that the susceptible variety Khao-tah-haeng 17, at all four predisposing temperature regimes, produced more typical lesions than hypersensitive lesions when inoculated with most of the blast fungus isolates. Tetep, Carreon, IR36 and Sensho produced more hypersensitive lesions than typical lesions at all four predisposing temperature regimes. Highly significant differences among predisposing temperature regimes and rice varieties for number of hypersensitive lesions and number of typical lesions were found. Symptom occurrence on a specific variety, as measured by the number of typical lesions, was more affected by predisposition temperature or blast isolate than by temperature and isolate combined. Symptom occurrence on a specific variety, as measured by the number of hypersensitive lesions, was more affected by blast isolate than by predisposition temperature.

본 실험중 이병성품종인 Khao-tah-haeng 17에서는 4개 접종전처리온도어디서나 접종에 사용된 6개 균주에 대하여 저항성보다는 이병성병반이 많이 나타났다. Tetep, Carreon, IR36 및 Sensho에서는 이병성병반 보다는 저항성병반이 많이 나타났다. 저항성 및 이병성병반수 공히 접종전 처리온도간, 공시종간에 고도의 유의성이 있었다. 특정품종에서 이병성병반의 발현은 접종전처리온도와 두열병균균주에 의해서 좌우되었으며 저항성병반의 발현은 접종전처리온도보다는 도열병균균주에 의해서 좌우되었다.