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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | González-Torralva, Fidel Rojano-Delgado, Antonia M. Luque de Castro, María D. Mülleder, Norbert De Prado, Rafael |
| Spatial Coverage | Spain |
| Description | Country affiliation: Spain Author Affiliation: González-Torralva F ( Department of Agricultural Chemistry and Edaphology, University of Córdoba, Córdoba, Spain. z82gotof@uco.es) |
| Abstract | The physiological and biochemical bases for glyphosate resistance and susceptibility in horseweed (Conyza canadensis L. Cronq.) populations collected from Córdoba, Huelva, Málaga, Jaén and Seville in southern Spain were investigated. Screening 25 populations treated with glyphosate (238gacidequivalentha(-1)) at the rosette stage (BBCH 14-15) revealed reductions in fresh weight (fw) of 9-99%. The resistant biotype (R C004) was 6.1 times more resistant than the susceptible biotype (S). Shikimate accumulation in both biotypes increased until 72h after treatment (HAT), and then continued to increase (to 61.2%) in the S biotype, but decreased by 40% in the R (C004) biotype. Differential glyphosate spray retention and foliar uptake of applied (14)C-glyphosate between the R (C004) and S biotype had no effect on resistance to this herbicide. Quantitative and qualitative tests showed greater (14)C-glyphosate mobility in the S biotype than in the R (C004) biotype. Glyphosate was metabolized faster in the R (C004) biotype than in the S biotype. The herbicide disappeared completely from the R (C004) biotype by conversion into glyoxylate, sarcosine and aminomethylphosphonic acid within 96 HAT. On the other hand, 41.43nmolg(-1)fw of all glyphosate applied remained in the S biotype and glyoxylate was its only non-toxic metabolite. These results suggest that glyphosate resistance in horseweed is due to two different non-target mechanisms, namely: (a) impaired glyphosate translocation and (b) glyphosate metabolism to other compounds. |
| File Format | HTM / HTML |
| ISSN | 01761617 |
| Issue Number | 17 |
| Volume Number | 169 |
| e-ISSN | 16181328 |
| Journal | Journal of Plant Physiology |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-15 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Conyza Drug Effects Glycine Analogs & Derivatives Herbicides Pharmacology Carbon Isotopes Metabolism Carboxylic Acids Genetics Dose-response Relationship, Drug Genotype Herbicide Resistance Introduced Species Organophosphonates Plant Leaves Random Allocation Sarcosine Spain Spectrophotometry Weed Control Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science Agronomy and Crop Science |
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