Drought stress and reactive oxygen species: Production, scavenging and signaling.

By M. H. Cruz de Carvalho. Plant Signalling & Behavior, 2008

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The Role of the Plant Antioxidant System in Drought Tolerance (2019, background): “Even under normal conditions, 1–2% of oxygen is consumed to produce ROS due to an over-reduction at complex I and III in the oxidative phosphorylation [53].”
Gene expression and activity of antioxidant enzymes in barley (Hordeum vulgare L.) under controlled severe drought (2015, background): “In response to drought stress plants are challenged by oxidative stress (Reddy et al. 2004; de Carvalho 2008; Kar 2011; Noctor et al. 2014).”
The Roles of Reactive Oxygen Metabolism in Drought: Not So Cut and Dried[1][C][W] (2014, background): “A summary of data on total extractable enzyme activities provides little evidence for a striking, consistent response between different plant species, but the reported effects generally involve unchanged or increased activities (de Carvalho, 2013).”
Hydrogen peroxide priming modulates abiotic oxidative stress tolerance: insights from ROS detoxification and scavenging (2015, background): “Drought stress is widely thought to induce oxidative stress by increasing the levels of H2O2 and singlet oxygen (de Carvalho, 2013).”