, Volume 56, Issue 4, pp 1093–1106 | Cite as

Physiological responses of Pterocladiella capillacea (Rhodophyta, Gelidiales) under two light intensities

  • T.B. Harb
  • A. Nardelli
  • F. Chow
Original paper


Macroalgae must be able to survive in conditions of different light intensities with no damage to their physiological performance or vital processes. Irradiance can stimulate the biosynthesis of certain photoprotective compounds of biotechnological interest, such as pigments and proteins. Pterocladiella capillacea is a shade-grown alga, which play a role key in the balance of marine ecosystems. In addition, it is considered one of the best sources of bacteriological agar and agarose with a wide pharmacological potential. In order to evaluate the photosensitivity in P. capillacea under 60 (control) and moderate light intensity of 300 μmol(photon) m–2 s–1, photosynthetic performance and chemical composition were assessed. P. capillacea showed photosensitivity without evidence of photodamage. The results indicate the possibility to increase a growth rate and probably infer productivity in long-term cultivation by stimulation at moderate light intensity. Increasing photosynthetic pigment and protein contents were also observed under medium light, an interesting result for functional ingredient approaches.

Additional key words

algae chlorophyll fluorescence growth rate pigments productivity radiation 









dry mass






control irradiance of 60 µmol(photon) m–2 s–1


electron transport rate


maximal electron transport rate


fresh mass


maximal quantum yield of PSII photochemistry


growth rate


saturation irradiance


irradiance of 300 µmol(photon) m–2 s–1






maximum photosynthesis


total soluble proteins




von Stosch enrichment solution


effective quantum yield of PSII photochemistry


photochemical quenching


nonregulated nonphotochemical quenching


regulated nonphotochemical quenching


photosynthetic efficiency


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Supplementary material

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© The Institute of Experimental Botany 2018

Authors and Affiliations

  1. 1.Institute of BioscienceUniversity of São PauloSão Paulo, SPBrazil

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