Preharvest UV-C Hormesis Induces Key Genes Associated With Homeostasis, Growth and Defense in Lettuce Inoculated With Xanthomonas campestris pv. vitians

• DOI: 10.3389/fpls.2021.793989
• Publication Date: 2022-01-17T06:45:38Z
• Authors: Amadou Sidibé; Marie Thérèse Cha...; Jean-François Lucier; Yanqun Xu; Carole Beaulieu
• Keywords: Preharvest; Hormesis; Plant disease

Preharvest application of hormetic doses ultraviolet-C (UV-C) generates beneficial effects in plants. In this study, within 1 week, four UV-C treatments 0.4 kJ/m2 were applied to 3-week-old lettuce seedlings. The leaves inoculated with a virulent strain Xanthomonas campestris pv. vitians (Xcv) 48 h after the last application. extent disease was tracked over time and transcriptomic analysis performed on leaf samples. Samples leaves, from both control treated groups, taken at two different times corresponding T2, treatment T3, 24 inoculation (i.e., 72 treatment). A significant decrease severity between observed days 4, 8, 14 pathogen inoculation. Data study revealed, that response effect alone and/or + Xcv, total 3828 genes differentially regulated fold change (|log2-FC|) > 1.5 false discovery rate (FDR) < 0.05. Among these, 2270 known function 1556 upregulated 714 downregulated. 10 candidate verified by qPCR generally consistent results. expressed under conditions present associated biological processes plant. These are involved series metabolic pathways ability resume normal growth defend themselves against potential stressors. results indicate dose preharvest can be considered as an eustress does not interfere plants carry set key physiological namely: homeostasis, defense.