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Determination of Conyza canadensis Levels of Sensitivity to Glyphosate Trimesium Sulphosate

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Authors
Pavlović, Danijela
Reinhardt, Charlie
Božić, Dragana
Vrbničanin, Sava
Article (Published version)
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Abstract
Changes in leaf anatomy were examined in two S. African populations of Conyza canadensis of which one was presumed to be resistant (CCPR) and the other susceptible (CCS) to glyphosate. Glyphosate was applied to plants, which were grown from seed collected from these populations, at rates of 1, 2 and 4 kg a.e. ha(-1) of TOUCHDOWN [active substance: glyphosate trimesium salt, 500 g L-1] that are equivalent to 2, 4 and 8 L ha (-1) of the herbicide Touchdown. Leaf samples for the light microscope (LM) analysis were collected 3, 7 and 24 h after treatment (HAT). Changes in chlorophyll and shikimate content of leaf material were also examined. Changes in the palisade and pith tissue of leaves were not detected in the investigated populations at 3 and 7 HAT. However, at 24 HAT the different herbicide doses caused changes in leaf anatomy. These changes (injuries) were detected in the CCS at all tested doses, but in the CCPR population of C. canadensis the injuries were observed at only the two... highest rates, 2 and 4 kg a.e. ha(-1). Chlorophyll and shikimate contents indicated significant differences between the treated and untreated plants of susceptible population only. Difference in glyphosate resistance between the CCS and CCPR populations was confirmed with an index of resistance of 1.58. This value of the index of resistance indicates that CCS population is 1.58 times more susceptible to glyphosate compared to CCPR population. (C) 2013 Friends Science Publishers

Keywords:
Chlorophyll / Horseweed / Leaf anatomy / Shikimate / Glyphosate tolerance
Source:
International Journal of Agriculture and Biology, 2013, 15, 6, 1091-1097
Publisher:
  • Friends Science Publ, Faisalabad
Projects:
  • Development of integrated management of harmful organisms in plant production in order to overcome resistance and to improve food quality and safety (RS-46008)
  • Syngenta company, S. Africa

ISSN: 1560-8530

WoS: 000329943100006

Scopus: 2-s2.0-84889071663
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URI
http://plantarum.izbis.bg.ac.rs/handle/123456789/282
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