Light dependency of the photosynthetic recovery of Nostoc flagelliforme

PS II photochemical efficiency (F_v/F_m) of Nostoc flagelliforme was examined after rewetting in order to investigate the light-dependency of its photosynthetic recovery. F_v/F_m was not detected in the dark, but was immediately recognized in the light. Different levels of light irradiation (4, 40 and 400 μmol photon m² s^-1) displayed different effects on the recovery process of photosynthesis. The intermediate level led to the best recovery of photochemical efficiency; the low light required longer and the high light inhibited the extent of the recovered efficiency. It was concluded that the photosynthetic recovery of N. flagelliforme is both light-dependent and influenced by photon flux density. This revised version was published online in June 2006 with corrections to the Cover Date.