Plant Soil Environ., 2014, 60(12):562-568 | DOI: 10.17221/655/2014-PSE

Determination of the influence of herbicides on dicotyledons plant transpiration using the sap flow methodOriginal Paper

V. Brant, J. Pivec, K. Hamouzová, P. Zábranský, J. Satrapová, M. Škeříková
Department of Agroecology and Biometeorology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic

Physiological parameters are sensitive and provide information on the toxicity of herbicides in plants. The impact of herbicide application on plant transpiration was evaluated by the sap flow method during 2009-2011. The aim of this work was to verify the sap flow method for determining the effect of herbicides on the basis of continuous measurements of the transpiration flow. Helianthus annuus was used as a model plant species. The two different herbicides tested in this study differed by the effect of active ingredients bromoxynil and clopyralid. The water flow was measured using sap flow meter T4.2. The impact of herbicides was assessed by comparing measured transpiration rate (Q) after herbicide application with an extrapolation of transpiration rate of plants before herbicide treatment (Qcalc). After treatment with bromoxynil the Q values decreased significantly compared to Qcalc. For plants treated by clopyralid, the decline of actual transpiration (Q) compared with the modelled one (Qcalc) was less substantial and the plants continued to transpire after the treatment. The effect of herbicides was also verified using infrared gas analyser and chlorophyll fluorescence meter.

Keywords: stomatal conductance; photosynthesis; weed

Published: December 31, 2014  Show citation

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Brant V, Pivec J, Hamouzová K, Zábranský P, Satrapová J, Škeříková M. Determination of the influence of herbicides on dicotyledons plant transpiration using the sap flow method. Plant Soil Environ. 2014;60(12):562-568. doi: 10.17221/655/2014-PSE.
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