Acknowledgement
Supported by : 한국과학재단
In this study, the relationships between sensitivity to oxyfluorfen, absorption of the herbicide, protoporphyrin IX(Proto IX) accumulation and activities of antioxidative enzymes were examined to identify the tolerance mechanism against oxyfluorfen in various rice cultivars having different level of tolerance to this herbicide. Absorption of oxyfluorfen in tolerant rice cultivars was slower than in susceptible cultivars. Proto IX accumulation in various rice cultivars treated with oxyfluorfen was higher in susceptible cultivars than in tolerant ones. In susceptible cultivars especially, Proto IX accumlated rapidly during the herbicide treatment in the dark. Large amounts of Proto IX accumulation were considered to cause membrane lipid peroxidation in the light. However, among the tested rice cultivars, there was little relationship between their tolerance to oxyfluorfen and the activities of antioxidative enzymes. Therefore, it is assumed that differential susceptibility of rice cultivars to oxyfluorfen was due to difference in their capability to absorb the herbicide and to subsequently accumulate Proto IX.
Oxyfluorfen에 대한 감수성이 상이한 것으로 보고된 7품종을 공시하여, oxyfluorfen에 대한 내성 및 감수성의 정도를 검정하고, 약제에 대해 각 품종이 나타내는 반응성의 차이를 해명하기 위하여 살초활성발현에 관여되는 작용기구에 대한 연구를 수행하였다. 1. Oxytluorfen 에 대한 감수성이 다른 7 품종에 대하여 경엽 및 근부처리를 실시한 결과 Baru, Hawon 및 Hunan 31이 내성 품종으로 Weld pelly, HP 1033, HP 907 및 HP 857이 감수성 품종으로 구분되었다. 각각의 품종 중에서 내성품종으로 Hunan 31과 감수성 품종인 HP 907 및 HP 857을 선정하여
Supported by : 한국과학재단