ORIGINAL ARTICLE
Dose-response and growth rate variation among glyphosate resistant and susceptible Conyza albida and Conyza bonariensis populations
 
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Laboratory of Biological Control of Pesticides, Department of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, Athens, Greece
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Agrotypos Publishing SA, Athens, Greece
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Laboratory of Agronomy, Faculty of Crop Science, Agricultural University of Athens, Athens, Greece
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Laboratory of Agronomy, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
CORRESPONDING AUTHOR
Ilias G. Eleftherohorinos   

Laboratory of Agronomy, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
Online publish date: 2019-04-04
Submission date: 2018-08-06
Acceptance date: 2019-03-20
 
Journal of Plant Protection Research 2019;59(1):32–40
KEYWORDS
TOPICS
ABSTRACT
Plant responses to glyphosate applied at different doses were examined for one glyphosate resistant (R) and one glyphosate susceptible (S) population of Conyza albida and C. bonarienis. Growth rates and development stages of five R C. albida and three R C. bonarienis populations were also compared with those of their respective S counterparts to investigate the possible impact of the glyphosate resistance trait on their fitness. The GR50 values for C. albida R (3.94−5.22 kg a.i. · ha−1) and S (0.24−0.31 kg a.i. · ha−1) populations were higher than those of C. bonariensis R (0.60−1.51 kg a.i. · ha−1) and S (0.10−0.13 kg a.i. · ha−1). The growth rate (slope b) of one R C. albida population was lower than the respective S and other R populations, while growth rates of most R and S C. bonariensis populations were similar. Some R populations showed inconsistent differences in some development stages when compared to those of the S ones, which cannot be attributed to the glyphosate resistance trait.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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