Two components of onset and recovery during photoinhibition of Ulva rotundata

  title={Two components of onset and recovery during photoinhibition of Ulva rotundata},
  author={Linda A. Franklin and Guy Levavasseur and C. Barry Osmond and William J. Henley and Joseph S Ramus},
Short-term (up to 5 h) transfers of shade-adapted (100 μmol · m−2 · s−1) clonal tissue of the marine macroalga Ulva rotundata Blid. (Chlorophyta) to higher irradiances (1700, 850, and 350 μmol · m−2 · s−1) led to photoinhibition of room-temperature chlorophyll fluorescence and O2 evolution. The ratio of variable to maximum (Fv/Fm) and variable (Fv) fluorescence, and quantum yield (ϕ) declined with increasing irradiance and duration of exposure. This decline could be resolved into two components… CONTINUE READING


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