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Stimuler les défenses des plantes contre botrytis cinerea par des rayonnements UV-C

Abstract : There is now a consensus around the idea that we must reduce theuse of pesticides (Plan Ecophyto). It is therefore necessary to develop cropsystems that have less need to be protected by pesticides in favor of aproduction system in which the "natural" defense mechanisms arestimulated. In this context, many solutions of chemical or biological originbased on stimulation of plant defense are now being developed but theireffectiveness is often judged to be random. In this work, we chose to useUV-C radiation to stimulate the defenses of lettuce and tomato againstBotrytis cinerea. The idea of exploiting radiation UV-C, as a stimulant ofplant food-borne defenses in culture, has never been tested. Our resultsclearly demonstrate a stimulatory effect of plant defenses by low andrepeated doses of UV-C (less than 1.70 kJ/m2). This stimulation isassociated with a reinforcement of the cell wall, an increase in the phenoliccompounds and the activity of certain antioxidant enzymes. When treatmentwith UV-C radiation is combined with a biological agent Bacillus subtilis, nosynergistic or even additive effect has been observed compared with asimple UV-C or B. subtillis treatment.
Keywords : Uv-C Control Pathogen
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Submitted on : Friday, March 30, 2018 - 1:39:08 PM
Last modification on : Wednesday, July 1, 2020 - 12:38:38 PM


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  • HAL Id : tel-01755100, version 1


Hilarion Vasquez. Stimuler les défenses des plantes contre botrytis cinerea par des rayonnements UV-C. Sciences agricoles. Université d'Avignon, 2017. Français. ⟨NNT : 2017AVIG0695⟩. ⟨tel-01755100⟩



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