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학술저널
저자정보
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한국식물병리학회 The Plant Pathology Journal 한국식물병리학회지 제9권 제1호
발행연도
1993.3
수록면
81 - 84 (4page)

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We have attempted to monitor the compositional change of race distribution after primary leaf blast incidence of rice caused by Pyricularia oryzae, for two years from 1989 to 1990, in a paddy field of Japonica type cultivar "Nakdongbyeo" in Chinju, Korea. KI-race compatible with Tongil lines was predominating over KJ-races at the primary infection period under average temperature of 20℃. The high rate of KI-race distribution was getting lower gradually, while the distribution of KJ-race was getting higher as the blast epidemic proceeds. This compositional change was attributed to the following evidences. Firstly, rate of appressorium formation at the primary infection stage was higher, and the time required for appressorium formation was shorter KI-races at low temperature of 20℃ than for KJ-races. Secondly, reisolation frequency was substantially higher for KI-races, when the conidial suspension was mixed to equal volume of KI and KJ-races and routinely inoculated into the seedlings. Thirdly, when the inoculated seedlings were exposed to two temperature regimes of dew chamber, i.e., low at 20℃ or high at 28℃, reisolation frequency of the KI-races was potentially higher at low temperature than at high temperature. However the overall frequency was generally higher for the KJ-races at both temperature regimes. Therefore, the early abundancy of KI-races was attributed to the systematic association of both the faster and more aggressive approssoria formation and the higher rate of reisolation frequency at low temperature. The decrease of KI-races at later epidemics might be due to their poor competition on the Japonica type cultivars compared to those of KJ-races.

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