Factors Affecting the Expression of Durable Resistance of Rice Cultivars to Blast caused by Pyricularia grisea Sacc 2. Components of the Resistance of Durably Resistant Cultivars for Rice Blast

벼 도열병에 대한 품종의 지속저항성 발현요인에 관한 연구 2. 도열병에 대한 지속저항성 품종의 저항성 구성요소

Etiological components of the rice cultivars possessing durable resistance to rice blast were evaluated. In the greenhouse test by artificial inoculation, number of leaf blast lesion in Dongjinbyeo was not increased by any race of the pathogen, while the lesion number on the resistant cultivar Palgongbyeo and susceptible cultivar Jinmibyeo was increased rapidly. Size of the lesion in Dongjinbyeo was smaller and progressed more slowly than the resistant cultivar Palgongbyeo until 11 days after inoculation. Latent period in Dongjinbyeo was intermediate. However, the period was significantly variable depending upon the races. Least amount of conidia was produced in Dongjinbyeo by race KJ-107 and the number of conidia was decreased rapidly from 11 days after inoculation.