Stimulating plant defences against botrytis cinerea by UV-C radiation ; Stimuler les défenses des plantes contre botrytis cinerea par des rayonnements UV-C
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Medientyp:
E-Book
Titel:
Stimulating plant defences against botrytis cinerea by UV-C radiation ; Stimuler les défenses des plantes contre botrytis cinerea par des rayonnements UV-C
Erschienen:
[Erscheinungsort nicht ermittelbar]: HAL CCSD, 2017
Sprache:
Französisch
Entstehung:
Hochschulschrift:
Dissertation, HAL CCSD, 2017
Anmerkungen:
Beschreibung:
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.