Reactive oxygen species (ROS) scavenging capacity
nounPronunciation: /riˈæktɪv ˈɒksɪdʒən ˈspiːʃiːz ˈskævɪndʒɪŋ kəˈpæsɪti/
The plant's biochemical ability to neutralize damaging free radicals through enzymatic and non-enzymatic antioxidant systems. This capacity determines cellular damage severity during oxidative stress from heat, drought, or light exposure.
Plain English
How well a plant can remove harmful free radical molecules using its natural defense chemicals.
Etymology & History
Usage
"Enhanced ROS scavenging capacity in drought-resistant cultivars prevents oxidative membrane damage."
Style guide notes: Specify ROS types (O₂•−, H₂O₂, •OH) and measurement methods (DPPH assay, TEAC) when quantifying capacity.
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Related Terms
Frequently Asked Questions
What mechanisms contribute to ROS scavenging?
Enzymatic systems like SOD, CAT, APX and non-enzymatic antioxidants like ascorbate and glutathione neutralize free radicals.
Why is ROS scavenging critical during abiotic stress?
Accumulated ROS cause lipid peroxidation and protein damage; effective scavenging prevents cellular deterioration and death.
Why Test Candidates on This?
Core concept in stress physiology assessments; tests understanding of cellular defense mechanisms and stress tolerance.
Required skill level: Mid