水稻不同品種對除草劑伏寄普之忍受性差異

黃秀鳳 張新軒 蔡文福

國立台灣大學 農藝系

摘 要

本研究以水稻不同品種為對象，另以一些具有敏感性或忍受性之植物參與比較，經伏寄普 (fluazifop-butyl) 葉面噴施後，發現闊葉植物之生長不受影響，禾本科植物除紅狐草外，地上部鮮重均明顯下降。水稻處理伏寄普後各品種間之反應有明顯差異，其中最敏感品種鵝卵朮與最具忍受性品種新竹烏腳尖之生物檢定 GR₅₀ 相差 3.9 倍。在水稻莖頂切片觀察上，敏感性品種鵝卵朮葉面噴施伏寄普 0.15 kg ai/ha後 2 天，葉鞘基部即出現明顯壞疽，而忍受性品種新竹烏腳尖雖其莖頂生長點受損，但在第 12 天後會因側芽出現而存活。

關鍵詞：伏寄普、水稻、敏感性、忍受性

Differential Tolerances of Rice Varieties to Fluazifop-Butyl

Shu-Fong Huang, Shin-Shinge Chang, and Wen-Fu Tsai

Department of Agronomy, National Taiwan University,

Taipei, Taiwan, ROC

Abstract

The objects of this study were to indentify the tolerant of rice (Oryza sativa L.) varieties to fluazifop-butyl {butyl-(R)-2-[4-[[5- (trifluoromethyl)-2- pyridinyl] oxy] phenoxy] propanoate} with foliar application. The shoot fresh weight of rice varieties were decreased obviously by fluazifop foliar-application 0.15 kg ai/ha; but the growth of red fescue (Festuca rubra L.) and dicotyledon plants were not affected . The rice variety Hsinchu Wu-Chueh-Chien is 3.9 times more tolerant than the susceptible variety O-Loan-Chu based on bioassay (GR₅₀) assay. Based on the microscopical observations of rice growth point, the sheath base of the susceptible variety O-Loan-Chu became necrosis 2 days after 0.15 kg ai/ha of fluazifop-butyl application. The growth point of this tolerant variety Hsinchu Wu-Chueh-Chien was injured, but new lateral bud of rice plant appeared 12 days after similar herbicide treatment.

Key words：fluazifop-butyl, rice, susceptible, tolerant