title: Photosynthesis limitations of grapevine after treatment with the fungicide fludioxonil.
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.
authors.affiliation: 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.
authors.forename: Anne-Noëlle
authors.initials: AN
authors.lastname: Petit
authors.forename: Florence
authors.initials: F
authors.lastname: Fontaine
authors.forename: Christophe
authors.initials: C
authors.lastname: Clément
authors.forename: Nathalie
authors.initials: N
authors.lastname: Vaillant-Gaveau
mesh_terms: D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D004149:Dioxoles / Q000008:administration & dosage / Q000494:pharmacology*; D005659:Fungicides, Industrial / Q000494:pharmacology*; D010788:Photosynthesis / Q000187:drug effects*; D018547:Plant Stems / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D011758:Pyrroles / Q000008:administration & dosage / Q000494:pharmacology*; D027843:Vitis / Q000187:drug effects / Q000378:metabolism*
chemical_list: D004149:Dioxoles; D005659:Fungicides, Industrial; D011758:Pyrroles; D002734:Chlorophyll; C108339:fludioxonil; D000077194:Chlorophyll A