Chayma Ouhibi
University of Avignon , France and University of Tunis El Manar,Tunisia
Title: Effects of UV-C radiations on the response of romaine lettuce to abiotic and biotic stress
Biography
Biography: Chayma Ouhibi
Abstract
Applied in high doses, UV-C radiations are harmful while administered at low doses. These same radiations stimulate beneficial answers. This phenomenon is known as hormesis and the beneficial dose is qualified hormic. The application of low doses of UV-C on fruits and vegetables in post harvest enhances resistance against pathogens; improve their nutritional quality and their performance to grow. This works were carried out on different species. In my thesis, we treated a single species of romaine lettuce var claudius after harvest with a non-harmful dose of UV-C (0.85 kJ.m-2) and we evaluated its effect on resistance to Botrytis cinerea (BC87) and Sclerotinia minor (SM) in their nutritional value during storage and their responses to salt stress. The analysis of all the results obtained showed that the UV-C dose decreases the sensitivity of romaine lettuce to these two pathogens, improve nutritional value by increasing the content in phenolic compound in ascorbic acid and acquire to plants from seeds pre-treated with UV-C greater potential for adaptation to salt stress.