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Reference: Gating in grapevine- Relationship between application of the fungicide fludioxonil and circadian rhythm on photosynthesis
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Abstract-

The aim of this study was to determine the impact of the fludioxonil (fdx) fungicide on the diurnal fluctuation in grapevine photosynthesis. Therefore, fdx treatment was performed at the end of flowering, at 8 am, 12 am or 7 pm. The study was performed in experimental field and several photosynthesis parameters were followed one day after treatment. Morning fdx treatment induced (i) a significant and simultaneous drop of both photosynthesis (Pn) and stomatal conductance between 8 am and 4 pm and (ii) an increase of intercellular CO2 concentration when compared to control plants. On the contrary, evening fdx treatment did not affect Pn whereas midday treatment caused Pn increase after 4 pm. These data suggest that (i) morning fdx treatment results in a non-stomatal limitation of Pn, (ii) midday treatment is more suitable to treat grapevine with fdx and (iii) a phenomenon of gating was noticed.

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Link to paper-

https://www.sciencedirect.com/science/article/pii/S0269749108003849

https://doi.org/10.1016/j.envpol.2008.07.017


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Publication Details

Published: 2009
Publication: Environmental Pollution
Issue: 2009 157-1 p130-134
Author: Petit A 2009
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