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

  • Original paper
  • Published:
Photosynthetica

Abstract

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.

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Abbreviations

A:

absorptance

Ab:

absorbance

APC:

allophycocyanin

DM:

dry mass

Car:

carotenoids

Chl:

chlorophyll

CL:

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

ETR:

electron transport rate

ETRMAX :

maximal electron transport rate

FM:

fresh mass

FV/FM :

maximal quantum yield of PSII photochemistry

GR:

growth rate

IK :

saturation irradiance

ML:

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

PC:

phycocyanin

PE:

phycoerythrin

P MAX :

maximum photosynthesis

TSP:

total soluble proteins

UV:

ultraviolet

VSES:

von Stosch enrichment solution

ΦPSII :

effective quantum yield of PSII photochemistry

Y(PSII) :

photochemical quenching

Y(NO) :

nonregulated nonphotochemical quenching

Y(NPQ) :

regulated nonphotochemical quenching

α:

photosynthetic efficiency

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  1. Institute of Bioscience, University of São Paulo, São Paulo, SP, CEP 05508-090, Brazil

    T.B. Harb, A. Nardelli & F. Chow

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  1. T.B. Harb
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  2. A. Nardelli
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Acknowledgements: The authors thank FAPESP (São Paulo Research Foundation; 2014/09380-3 and Biota/Fapesp 2013/50731-1) and CNPq (National Counsel of Technological and Scientific Development) for financial support and scholarships. F. Chow thanks CNPq for CNPq Research Productivity Scholarship (303937/2015-7).

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Harb, T., Nardelli, A. & Chow, F. Physiological responses of Pterocladiella capillacea (Rhodophyta, Gelidiales) under two light intensities. Photosynthetica 56, 1093–1106 (2018). https://doi.org/10.1007/s11099-018-0805-9

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