Different Physiological Activity of Selected Rice Cultivars to Diphenylether Herbicide, Oxyfluorfen - VI. Responses of Oxyfluorfen - Similar Herbicides

Oxyfluorfen에 대한 내성(耐性) 및 감수성(感受性) 벼품종(品種)의 생리활성(生理活性) 기구(機構) - VI. 유사제초제(類似除草劑)에 대한 반응(反應)

This study was conducted to investigate the protox activity, the PPIX accumulation and the activity of antioxidative enzymes of the oxyfluorfen-tolerant and -susceptible rice cultivars by oxyfluorfen and oxytluorfen-similar herbicides treatment. When treated with acifluorfen, bifenox or oxadiazon, the oxyfluorfen-tolerant rice cultivars showed less decreased in fresh weight than the susceptible rice cultivars. The inhibition of protox activity was in the order of acifluorfen > oxyfluorfen > bifenox > oxadiazon, and the PPIX accumulation was in the sequence of oxadiazon > acifluorfen > oxyfluorfen > bifenox. The inhibition of protox activity and the PPIX accumulation by the herbicide was greater in the susceptible rice cultivars than in the tolerant rice cultivars. The effect inhibiting the decrease of chlorophyll content resulting from the treatment of GC, tetrapyrrole biosynthesis inhibitor, was in the order of oxyfluorfen > acifluorfen > bifenox > oxadiazon, and the tolerant rice cultivar had more than the susceptible rice cultivar. In the treatment of DPE and oxadiazon, the activities of MDAR, POX and GR was higher in the tolerant rice cultivar than in the susceptible rice cultivar, and in the case of POX isozyme the activities of main D and E bands increased in the tolerant rice cultivars at tested herbicides but they didn't in the susceptible rice cultivar.

Oxyfluorfen에 내성 및 감수성 벼 품종들을 oxyfluorfen과 작용기작이 유사한 수종의 제초제에 대한 protox 활성, PPIX 축적 및 항산화효소 활성을 조사하였다. l. Oxyfluorfen에 내성(耐性) 벼품종(品種)들은 acifluorfen, bifenox 및 oxadiazon 처리에서도 감수성(感受性) 벼품종(品種)들보다 생체중 감소가 적었다. 2. Protox 활성(活性) 저해(沮害)는 acifluorfen > oxyfluorfen > bifenox > oxadiazon 순이었고, PPIX 축적(蓄積)은 oxadiazon > acifluorfen > oxyfluorfen > bifenox 순이다. 약제(藥劑)에 의한 protox 활성(活性) 저해(沮害)와 PPIX 축적(蓄積)은 내성(耐性) 벼품종(品種)보다는 감수성(感受性) 벼품종(品種)에서 컸다. 3. Tetrapyrrole 생합성(生合性) 억제제(抑制劑)인 GC 처리에 따른 chlorophyll 함량의 감소 억제효과는 oxyfluorfen > acifluorfen > bifenox > oxadiazon 순이었고, 감수성(感受性) 벼품종(品種)보다는 내성(耐性) 벼품종(品種에서 컸다. 4. DPE계 와 oxadiazon 처리시 MDAR, POX 및 GR 활성(活性)은 내성(耐性) 벼품종(品種)이 감수성(感受性) 벼품종(品種)보다 높았으며, POX 동위요소(同位酵素)는 각 공시약제에서 내성(耐性) 벼품종(品種)은 main D, E band 활성(活性)이 증가하였으나 감수성(感受性) 벼품종(品種)은 변화가 없었다.