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Key Event: 2456
Key Event Title
Photosystem II inhibition
Short name
Biological Context
| Level of Biological Organization |
|---|
| Molecular |
Cell term
Organ term
Event Components
Key Event Overview
AOPs Including This Key Event
| AOP Name | Role of event in AOP | Point of Contact | Author Status | OECD Status |
|---|---|---|---|---|
| PSII inhibition by atrazine leading to rice yield loss | MolecularInitiatingEvent | SURIYA S (send email) | Under development: Not open for comment. Do not cite |
Taxonomic Applicability
Life Stages
Sex Applicability
Key Event Description
Inhibition of the photosystem II (PSII) complex, specifically via binding to the D1 protein at the plastoquinone B (QB) binding site. This prevents the transfer of electrons from the primary electron acceptor (QA) to the secondary electron acceptor (QB), blocking the light-dependent reactions of photosynthesis.
How It Is Measured or Detected
Measured via chlorophyll fluorescence (Fv/Fm ratio) using a pulse-amplitude-modulated (PAM) fluorometer, or via direct measurement of oxygen evolution (Hill reaction) in isolated chloroplasts.
Domain of Applicability
Oryza sativa