Ion chromatography analysis of phosphite uptake and translocation by potato plants: Dose-dependent uptake and inhibition of Phytophthora infestans development |
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| Affiliation: | 1. Department of Plant and Animal Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada;2. Department of Civil and Resource Engineering, Dalhousie University, Halifax, NS B3J 2X4, Canada;3. Ivan Curry School of Engineering, Acadia University, Wolfville, NS B4P 2R6, Canada;1. Department of Forest Botany, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland;2. Laboratory of Dendrometry and Forest Productivity, Warsaw University of Life Sciences—SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland;1. Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan;2. Department of Earth Science and Astronomy, The University of Tokyo, Komaba, Meguroku, Tokyo 153-8902, Japan;2. Department of Physics, Payame Noor University, 19395-3697 Tehran, Iran;1. INRA, UMR 1347 Agroécologie, ERL CNRS 6300, 17 Rue Sully, BP 86510, 21065 Dijon Cedex, France;2. Institut Jean-Pierre Bourgin (IJPB), UMR 1318 INRA/AgroParisTech, INRA-Versailles, 78026 Versailles, France;1. Georgia Institute of Technology, 777 Atlantic Drive, Atlanta, GA 30332-0250, USA;2. Suniva Inc., 5765 Peachtree Industrial Blvd., Norcross, GA 30092, USA;1. School of Electrical, Electronic and Computer Engineering, North-West University, Potchefstroom Campus, Potchefstroom, South-Africa;2. Unit for Engineering Research, North-West University, Potchefstroom Campus, Potchefstroom, South-Africa |
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| Abstract: | Phosphite-based fungicides are increasingly used to control fungi-like plant pathogens from the Oomycetes group. A rapid, precise, and cost-effective suppressed conductivity high performance ion chromatography (HPIC) method was developed to assess the concentrations of soluble phosphites (Phi) and phosphates (Pi) in plant samples. This technique was used to determine the amount of Phi and Pi in leaves and tubers of potato plants following foliar applications of the Phi-based fungicide Confine™. High amounts of Phi were determined in both leaves and tubers indicating that potato plants efficiently uptake and translocate the fungicide. The number of applications of Confine™ and its concentration were found to be directly proportional with the amount of Phi detected in potato plants and inversely proportional with the development of Phytophthora infestans (Mont.) de Bary in these plants. Levels of Phi comparable to those determined in plants were found to strongly inhibit the growth of P. infestans in vitro. The simultaneous estimation of the in planta Phi concentration and of the sensitivity of P. infestans to Phi represent the most comprehensive approach of assessing the efficacy of Phi-based fungicides in controlling late blight development in potatoes. |
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| Keywords: | Phosphite Fungitoxic Late blight Potato Confine™ |
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