Photosynthesis limitations of grapevine after treatment with the fungicide fludioxonil |
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Authors: | Petit Anne-Noëlle Fontaine Florence Clément Christophe Vaillant-Gaveau Nathalie |
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Institution: | Laboratoire de Stress, Défenses et Reproduction des Plantes, URVVC-SE UPRES EA 2069, Université de Reims Champagne-Ardenne, UFR Sciences, Moulin de la Housse, B.P. 1039, 51687 Reims Cedex 2, France. |
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Abstract: | The aim of this work was to determine the major limitations to photosynthesis induced by the fungicide fludioxonil (fdx) on nontarget grapevines using cutting as a model. The fdx treatments (1.2, 6, and 30 mM) induced a net photosynthetic rate ( P n) decrease without changes in stomatal conductance, suggesting a nonstomatal limitation. Fdx effects on P n were related neither to photosynthetic capacity alteration in leaves nor to loss in PSII activity. The mechanism underlying photosynthesis reduction differed according to the concentration. Fdx at 6 mM led to an increase of light requirement for photosynthesis while 30 mM fdx induced an increase in the respiration rate in the light. P n decrease after 1.2 mM fdx could rather be related to wetness caused by the spraying than to fungicide toxicity. P n recovered 10 days after treatment, meaning that fdx had little deleterious effect on plant physiology or that grapevine has a great capacity to overcome this temporary stress. |
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