How lower level of endogenous ROS can affects the bacterial survivability?

I don’t think that low concentrations of endogenous ROS could have any effect on DNA. However, it is not possible to generalize to all bacteria species and even strains. Usually ROS generation is stress-induced. So mainly severe and persistent stress factors may lead to accumulation of high levels of ROS that could overwhelm protective elements. Bacteria contain protective proteins that can detoxify ROS (SodA, SodB, SodC, AhpCF, KatG, KatE) and counter damage (e.g., SoxRS, OxyRS, and SOS regulons). Recently some authors suggest that most of the reactive oxygen species and free radicals are more likely be bacteriostatic than bacteriocidal.

I would recommend reading:

“Diagnosing oxidative stress in bacteria: not as easy as you might think” (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4380616/),

"Reactive oxygen species and the bacterial response to lethal stress" (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4254325/)

"Oxidative stress, protein damage and repair in bacteria" (https://www.nature.com/articles/nrmicro.2017.26)

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

Which cell line should we use to perform biological dosimetry experiments?

Which fluorescent dye to use for measuring total ROS production?

What is the exact mechanism of the antimicrobial effect of local anesthetics?

How to calculate Ligand-active site distance in a ligand-protein complex from MD simulation?

Calculating volume of DNA required from DNA concentration?

Has anyone used the Illumina ITS1 primer sets?

Is there an open source free software for text mining and sentiment analysis?