Evaluation of selected parameters of photosynthesis as herbicide stress indicators on the example of glyphosate
Karol Wysocki 1, A-F  
Tadeusz Banaszkiewicz 2, A,C,E-F
Jacek Olszewski 3, A-B,E-F
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Department of Horticulture, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
Department of Entomology, Phytopathology and Molecular Diagnostics, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
Didactic-Experimental Center, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
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
Karol Wysocki   

Department of Horticulture, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 21, 10-957 Olsztyn, Poland
Online publish date: 2018-10-02
Submission date: 2018-01-16
Acceptance date: 2018-08-06
Journal of Plant Protection Research 2018;58(3):241–245
This study was aimed at evaluating the effect of sublethal doses of glyphosate on physiological parameters of a common ornamental plant Mexican marigold (Tagetes erecta). The herbicide was applied in the following doses: 720 g ha-1 (standard field dose), 144 g ha-1, 28.8 g ha-1, and 14.4 g ha-1, in the form of a spraying treatment of plants in a specialist spraying chamber. The plants were then determined for the net assimilation rate and for a leaf greenness index. Herbicide application in the sublethal doses, i.e. below 720 g ha-1, caused disorders in both analyzed physiological parameters of plants. The glyphosate dose of 144 g ha-1 elicited transient disorders in leaf greenness index. In turn, the use of the lower doses (28.8 g ha-1 and 14.4 g ha-1) caused a short-lasting increase in net photosynthesis rate in the plants that was accompanied by a decreased value of the leaf greenness index. Study results demonstrate the effect of sublethal doses of glyphosate as a stress factor in parameters associated with the process of photosynthesis in plants.
The authors have declared that no conflict of interests exist.
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