Gating in grapevine: relationship between application of the fungicide fludioxonil and circadian rhythm on photosynthesis.

Laboratoire de Stress, Défenses et Reproduction des Plantes, URVVC-SE EA 2069, Université de Reims Champagne-Ardenne, UFR Sciences Exactes et Naturelles, F-51687 Reims Cedex 2, France.
Environmental Pollution (Impact Factor: 3.73). 10/2008; 157(1):130-4. DOI: 10.1016/j.envpol.2008.07.017
Source: PubMed

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 CO(2) 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.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Fungicides are widely used to control pests in crop plants. However, it has been reported that these pesticides may have negative effects on crop physiology, especially on photosynthesis. An alteration in photosynthesis might lead to a reduction in photoassimilate production, resulting in a decrease in both growth and yield of crop plants. For example, a contact fungicide such as copper inhibits photosynthesis by destroying chloroplasts, affecting photosystem II activity and chlorophyll biosynthesis. Systemic fungicides such as benzimidazoles, anilides, and pyrimidine are also phytotoxic, whereas azoles stimulate photosynthesis. This article focuses on the available information about toxic effects of fungicides on photosynthesis in crop plants, highlighting the mechanisms of perturbation, interaction, and the target sites of different classes of fungicides.
    Photosynthesis Research 02/2012; 111(3):315-26. · 3.19 Impact Factor

Full-text (2 Sources)

Available from
Jun 3, 2014