Ultraviolet-B (UV-B) radiation (0.5, 1.0, 1.5, and 3.0 W m
?2) induced higher H
2O
2 production and lipid peroxidation in alga
Gelidium amansii inhabiting in lower subtidal regions than upper subtidal alga
Ptercladiella capillacea. Compared to
G. amansii, mycosporine-like amino acid (MAA) concentration in
P. capillacea was higher and can be increased by 0.5–1.0 W m
?2 UV-B, while carotenoid concentration was lower but also increased by 1.5–3.0 W m
?2 UV-B. UV-B increased ascorbate concentration, but to a higher degree in
P. capillacea. UV-B decreased glutathione concentration, but to a higher degree in
G. amansii. UV-B increased ascorbate peroxidase (APX) and glutathione reductase (GR) activities in
P. capillacea but decreased them in
G. amansii. UV-B increased superoxide dismutase and catalase activities, but to a higher degree in
G. amansii. So,
G. amansii suffered greater oxidative stress from UV-B radiation.
P. capillacea can effectively reduce UV-B sensitivity by increasing sunscreen ability and antioxidant defense capacity.
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