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標題: Non-Target Site Mechanisms of Resistance to Fluazifopbutyl of Goosegrass (Eleusine indica (L.) Gaertn.) in Taiwan: Uptake, Translocation and Metabolism
作者: Wan-Ting Lin
Yeong-Jene Chiang
Chang-Sheng Wang
Ching-Yuh Wang
關鍵字: Fluazifop;Resistance mechanism;Uptake;Translocation;Metabolism
出版社: 臺中巿: 國立中興大學農學院
Project: 農林學報, Volume 65, Issue 1, Page(s) 1-14.
Fluazifop-P-butyl, a selective graminicide, has been widely used to control annual grass weeds in Taiwan for more than three decades; and in 2003 a resistant (R) biotype of goosegrass [Eleusine indica (L.) Gaertn.] was found in guava (Psidium guajava L.) field at Kaohsiung in southern Taiwan. The spectrum of crossand multiple-resistance for R- and susceptible (S)-biotypes of this goosegrass suggested that both target site and non-target site factors might exist simultaneously. In this study the non-target site resistance mechanisms, i.e., differential uptake, translocation and metabolism of this herbicide, were investigated. Within 7 days after treatment (DAT), no significant difference was observed in the uptake of foliar-applied 14C-fluazifop-butyl between the S and R biotypes, with only a slightly higher translocation of 14C-labeled compounds, including parental form, acid form and polar metabolites derived from 14C-fluazifop-butyl, out of the treated leaf to upper leaves in R-biotype. Yet, it has been clearly shown while most of 14C-fluazifop-butyl absorbed was metabolized to its acid form and polar metabolites at 7 DAT, more polar metabolites were found in the treated leaf and upper leaves of R-biotype. Accordingly, results from the uptake, translocation and metabolism experiments suggest that increased metabolism is a primary mechanism of fluazifop resistance in R-biotype of goosegrass in Taiwan. The role of acetyl-coenzyme A carboxylase (ACCase; EC, the target enzyme of this graminicide, in resistance remains to be evaluated.
Appears in Collections:農林學報 第65卷 第1期

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