Susceptibility of the species Conyza canadensis (L.) Cronquist and Conyza bonariensis (L.) Cronquist to glyphosate | Osetljivost vrsta Conyza canadensis (L.) Cronquist i Conyza bonariensis (L.) Cronquist na glifosat
2008
Pavlovic, D., Institut za zastitu bilja i zivotnu sredinu, Beograd (Serbia) | Vrbnicanin, S., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Reinhardt, C., University of Pretoria (South Africa). Faculty of Natural and Agric Sciences, Department of Plant Protection and Soil Sciences | Fischer, A., University of California, Davis (USA). Department of Plant Sciences
Changes in leaf anatomy were examined in suspectedly resistant populations of Conyza canadensis and Conyza bonariensis after application of 2, 4 and 8 L/ha of the product Touch down (500 g a.i. glyphosate/L). Samples for the analysis (LM, TEM) were collected 3, 7 and 24 h after herbicide application. Changes in chlorophyll and shikimic acid contents were also examined in the population tested. Changes in the anatomy of leaves were not detected in the investigated populations 3 and 7 h after herbicide application. However, 24 h after application of different herbicide rates, differences were observed in leaf anatomy. Injuries were detected in Conyza bonariensis population after application of 2 L/ha, and in Conyza canadensis population after treatment with the highest glyphosate rate (8 L/ha). Changes were detected on cell walls, chloroplast lamellae and chloroplasts themselves. Based on chlorophyll and shikimic acid contents, significant statistical differences were detected between the treated and control plants.
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