Time sequence of the damage to the acceptor and donor sides of photosystem II by UV-B radiation as evaluated by chlorophyll a fluorescence

• DOI: 10.1007/s11120-007-9177-x
• Publication Date: 2007-05-07T07:09:28Z
• Authors: Jack J. S. van Re...; Wim J. Vredenberg; Gustavo C. Rodrigues
• Keywords: Fluorometer; P680; Acceptor; P700; Ultraviolet B radiation

The effects of ultraviolet-B (UV-B) radiation on photosystem II (PS II) were studied in leaves Chenopodium album. After the treatment with UV-B damage was estimated using chlorophyll a fluorescence techniques. Measurements modulated pulse amplitude fluorometer revealed that efficiency decreased both increasing time and intensity UV-B. Fluorescence induction rise curves analyzed mechanistic model energy trapping. It appears by occurs first at acceptor side II, only later donor side.