I need to assess the tolerance of different plant species to rare earth elements, and I know it’s important to measure reactive oxygen species, but since they’re unstable, this experiment has proven quite difficult for me to carry out.
I read that acetic acid is also measured; I have a protocol for that which is easier since it uses spectrophotometry, but I’m not sure if it’s sufficient to replace the measurement of ROS.
Thank you for your responses and comments. Please let me know if there are any other protocols I can use to replace the measurement of ROS.
Measuring ROS directly is useful, but it’s not the only way to assess oxidative stress. Because ROS are highly reactive and short-lived, many researchers rely on indirect markers instead.
Measuring acetic acid wouldn’t generally be considered a substitute for ROS, as it’s not a standard indicator of oxidative stress in plants. More commonly, researchers measure lipid peroxidation (e.g., MDA using the TBARS assay), hydrogen peroxide (H₂O₂), antioxidant enzyme activities such as SOD, CAT, APX, and POD, or non-enzymatic antioxidants like ascorbate and glutathione. These parameters are often used together to evaluate how plants respond to stress, including exposure to rare earth elements.
If direct ROS detection is difficult, combining several of these biochemical markers can provide a reliable picture of oxidative stress and the plant’s antioxidant response.