도열병의 특이적저항성에 관여하는 항균성물질인 phytoalexin을 친화적조합 혹은 비친화적조합에서 광범위하게 조사하였고 더 나아가 이의 경시적인 생성량과 생성속도 그리고 질소과용에 의한 생성량의 변화를 조사한 결과는 다음과 같다. 1. 공시수도품종 진흥, 수원 288호, 밀양 23호, Fukei 95, Chikeung, 노풍, 유신, 이리 344호, 9품종과 공시도열병균 race
Thytealexin activities were investigated in compatible and incompatible combinations between rice cultivars and races of Pyricularia oryzae by using the spore-germination test in the diffusates from surface of leaf-blade treated with the spore suspensions. In compatible and incompatible combinations between nine cultivars of rice and three races of the fungus, phytoalexin activities were recognized in all combinations, and were much higher in incompatible combinations than in compatible combinations with significant differences. Activities of phytoalexin were increased with the time, and maximal peaks of them were at 36 hours after inoculation, and thereafter decreased. The activities were generally decreased in all combination by heavy applications of nitrogen fertilizer, especially in incompatible combinations. On the other hand, fresh juices from leaves of rice cultivars which were not inoculated with the fungus showed no phytoalexin activities.
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