期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 56, 期 15, 页码 6761-6767出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf800919u
关键词
chlorophyll fluorescence; fludioxonil; fungicide; gas exchanges; grapevine; phytotoxicity
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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