Movement of paraquat in resistant and susceptible biotypes of Erigeron philadelphicus and E. canadensis |
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Authors: | Yoshiyuki Tanaka Hideo Chisaka Hitoshi Saka |
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Institution: | Lab. of Pesticide Resistance, National Inst. of Agro-Environmental Sciences, Yatabe-machi, Tsukuba, Ibaraki 305, Japan;Agriculture, Forestry and Fisheries Research Council Secretariat, Ministry of Agriculture, Forestry and Fisheries, Kasumigaseki, Tokyo 100, Japan;and;Lab. of Plant Sociology, National Inst. of Agro-Environmental Sciences, Yatabe-machi Tsukuba, Ibaraki 305, Japan. |
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Abstract: | Paraquat (1,1'-dimethyl-4,4'-bipyridinium) resistant biotypes of Erigeron philadelphicus and E. canadensis , from fields where paraquat had been used for weed control, showed more than 100 times higher resistance than the susceptible biotype of both plants. Excised leaves of the susceptible biotypes wilted when supplied with more than 5 μ M paraquatat at the cut ends, but those from the resistant biotypes did not wilt even at 500 μ M. Autoradiographs indicated that (14CH3)-paraquat taken up through the cut ends was rapidly distributed through the vascular system in leaves of the susceptible biotype, but was barely translocated in leaves of the resistant biotype. The amount of paraquat taken up during 48 h in the resistant biotype was 0.5% of that in the susceptible biotype in light. This difference in paraquat movement may be correlated with paraquat resistance in Erigeron. |
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Keywords: | Herbicide transpiration transport vascular system |
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