Whether flavonoids play significant antioxidant roles in plants challenged by photooxidative
stress of different origin has been largely debated over the last few decades. A critical review …

Conspectus Porphyrin derivatives are ubiquitous in nature and have important biological
roles, such as in light harvesting, oxygen transport, and catalysis. Owing to their intrinsic π …

Light is important for plants as an energy source and a developmental signal, but it can also
cause stress to plants and modulates responses to stress. Excess and fluctuating light result …

Ultraviolet-B (UV-B) radiation is an intrinsic fraction of sunlight that plants perceive through
the UVR8 photoreceptor. UVR8 is a homodimer in its ground state that monomerizes upon …

Abstract Ultraviolet-A radiation (UV-A: 315–400 nm) is a component of solar radiation that
exerts a wide range of physiological responses in plants. Currently, field attenuation …

Sunlight damages photosynthetic machinery, primarily photosystem II (PSII), and causes
photoinhibition that can limit plant photosynthetic activity, growth and productivity. The extent …

Increased UV-B radiation on the earth's surface due to depletion of stratospheric ozone layer
is one of the changes of current climate-change pattern. The deleterious effects of UV-B …

Low doses of UV-B light (280 to 315 nm) elicit photomorphogenic responses in plants that
modify biochemical composition, photosynthetic competence, morphogenesis, and defense …

When photosynthetic organisms are exposed to abiotic stress, their photosynthetic activity is
significantly depressed. In particular, photosystem II (PSII) in the photosynthetic machinery is …

Exposure to the shortest wavelengths in sunlight, ultraviolet light, constitutes a deleterious
ecological factor for many microorganisms. The use of secondary metabolites as sunscreens …