Lipo-Chitooligosaccharides (LCOs) as Elicitors of the Enzymatic Activities Related to ROS Scavenging to Alleviate Oxidative Stress Generated in Tomato Plants under Stress by UV-B Radiation

Abstract

Exposure to ultraviolet-B (UV-B) radiation can lead to oxidative damage in plants, increasing reactive oxygen species (ROS) production. To overcome ROS burst, plants have antioxidant mechanisms related to ROS scavenging which can be improved by elicitation with biological agents or derived molecules (elicitors), as they can trigger a physiological alert state called “priming”. This work describes the effects of lipo-chitooligosaccharides (LCOs) treatment applied to tomato plants under UV-B stress. The LCOs used in the study are produced by three species of the genus Ensifer (formerly Sinorhizobium) (SinCEU-1, SinCEU-2, and SinCEU-3) were assayed on tomato plants under UV-B stress. LCOs were able to significantly increase most of the enzymatic activities related to ROS scavenging while non-enzymatic antioxidants were not modified. This response was associated with a lower oxidative stress, according to malondialdehyde (MDA) levels and the higher antioxidant capacity of the plants. Furthermore, the photosynthetic efficiency of LCOs-treated plants indicated a better physiological state than the control plants. Therefore, although more studies and deepening of certain aspects are necessary, LCOs have shown great potential to protect plants from high UV-B radiation conditions.

Responses of the bacterial community of tobacco phyllosphere to summer climate and wildfire disease

“…Motility can help wildfire disease pathogen search for favorable sites, facilitate spreading and locate the most preferred site ( Haefele and Lindow, 1987 ) . Toxin such as syringomycin produced by Pseudomonas syringae is responsible for pore formation and nutrient leakage through the host cell membrane ( Pritchard et al., 2009 ) , Besides, plants generally produce phenolic substances to counteract increased stress levels ( Lucas et al., 2022 ). This might explain the significant enrichment of organic metabolic genes in the T3 group community.…”

Effect of plant growth regulators DA-6 and COS on drought tolerance of pineapple through bromelain and oxidative stress

“…COSs enhance the production of phenolic compounds during barley germination to improve the antioxidant capacity of malt [ 36 ]. COSs alleviate oxidative stress generated in tomato plants under stress by UV-B radiation [ 37 ].…”