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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Gronwald, J. W.;
Eberlein, C. V.;
Betts, K. J.;
Rosow, K. M.;
Ehlke, N. J.;
Wyse, D. L. |
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| Author Affiliation: | USDA/ARS and Dept. of Agron. and plant Genetics, Univ. of Minnesota |
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| Title: | Diclofop Resistance in a Biotype of Italian Ryegrass. |
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| Source: | Plant Physiology. Vol. 89, No. 4, April 1989, p. 115. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| Keywords: | TIC Keywords: Lolium multiflorum; Diclofop; Resistance
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| Abstract/Contents: | "In 1987, a biotype of Italian ryegrass (Lolium multiflorum) resistant to the aryloxyphenoxypropionic (AOPP) acid herbicide diclofop-methyl was found in a field in Oregon. We compared the growth response of resistant and susceptible biotypes to diclofop-methyl and sethoxydim, a cyclohexandione (CHD) herbicide which has the same site of action as diclofop-methyl. At the whole plant level, the resistant biotype was tolerant to field rates of diclofop-methyl but not to sethoxydim. Acetyl-CoA carboxylase (ACCase) was extracted from etoilated leaf tissue of the resistant and susptible biotypes and I50 values for AOPP acid herbicides (Diclofop, haloxyfop, quizalofop) and CHD herbicides (sethoxydim, clethodim) were determined. The I50 values for the AOPP acid herbicides were approximately 15-fold greater in tissue extracts from the resistant biotype. There was little or no difference in I50 values for sethoxydim and clethodim in resistant and susceptible biotypes. The results suggest that diclofop resistance is due to a modification at the site of action (ACCase). this modification results in resistance to the AOPP acid herbicides but not to the CHD herbicides." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gronwald, J. W., C. V. Eberlein, K. J. Betts, K. M. Rosow, N. J. Ehlke, and D. L. Wyse. 1989. Diclofop Resistance in a Biotype of Italian Ryegrass.. Plant Physiol. 89(4):p. 115. |
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