期刊
CURRENT OPINION IN TOXICOLOGY
卷 29, 期 -, 页码 57-64出版社
ELSEVIER
DOI: 10.1016/j.cotox.2022.02.003
关键词
Reactive oxygen species (ROS); Oxidative damage; Non-photochem-ical chlorophyll fluorescence quenching (NPQ); Dose-response rela-tionship; Hormetic response
类别
Hormesis in photosystem II is a dose or-time-response relationship that disrupts homeostasis, triggered by the non photochemical fluorescence quenching mechanism to protect the photosynthetic apparatus. A basal level of ROS is necessary for optimal plant growth, while a low increased level of ROS is beneficial for triggering hormetic responses.
Hormesis in photosystem II (PSII) that is observed in appropriately planned studies is a dose or-time-response relationship to a disruption of homeostasis illustrated by U-shaped response curves. PSII that uses the light energy to oxidize water into molecular oxygen and delivers electrons and protons is more susceptible than photosystem I (PSI) to photo damage. A hormetic response of PSII is triggered by the non photochemical fluorescence quenching (NPQ) mechanism that is a strategy to protect the photosynthetic apparatus from photo-oxidative damage by dissipating excess light energy as heat and preventing the destructive reactive oxygen species (ROS) creation. A basal level of ROS is needed for optimal plant growth, while a low increased level of ROS is beneficial for triggering hormetic responses, and a high level of ROS out of the boundaries is considered harmful to plants.
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