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Alterations in architecture and metabolism induced by ultraviolet radiation-B in the carragenophyte Chondracanthus teedei (Rhodophyta, Gigartinales)

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Abstract

The in vivo effect of ultraviolet radiation-B (UVBR) in apical segments of Chondracanthus teedei was examined. Over a period of 7 days, the segments were cultivated and exposed to photosynthetically active radiation (PAR) at 80 μmol photons m−2 s−1 and PAR + UVBR at 1.6 W m−2 for 3 h per day. The samples were processed for electron microscopy and histochemistry; also was analyzed growth rates, mitochondrial activity, protein levels, content of photosynthetic pigments and photosynthetic performance. UVBR elicited increased cell wall thickness and accumulation of plastoglobuli, changes in mitochondrial organization and destruction of chloroplast internal organization. Compared to controls, algae exposed to PAR + UVBR showed a growth rate reduction of 55%. The content of photosynthetic pigments, including chlorophyll a and phycobiliproteins, decreased after exposure to PAR + UVBR. This result agrees with the decreased photosynthetic performance observed after exposing algae to PAR + UVBR. Irradiation also elicited increased activity of the antioxidant enzyme glutathione peroxidase and decreased mitochondrial NADH dehydrogenase activity, which correlated with the decreased protein content in plants exposed to PAR + UVBR. Taken together, these findings strongly indicate that UVBR negatively affects the architecture and metabolism of the carragenophyte C. teedei.

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Abbreviations

α :

Photosynthetic efficiency

APC:

Allophycocyanin

ANOVA:

Analysis of variance

β :

Photoinhibition

CFC:

Chlorofluorocarbons

Chl a :

Chlorophyll a

rETR:

Relative electron transport rate

FW:

Fresh weight

GPx:

Glutathione peroxidase assay

GRs:

Growth rates

LM:

Light microscopy

MCF:

Methyl chloroform

MAAs:

Mycosporine-like amino acids

PAM:

Pulse amplitude-modulated

Pmax:

Maximum photosynthetic rate

PAR:

Photosynthetically active radiation

PC:

Phycocyanin

PE:

Phycoerythrin

RLC:

Rapid light curve

rETR:

Relative electron transport rate

SEM:

Scanning electron microscope

TEM:

Transmission electron microscope

UVR:

Ultraviolet radiation

UVBR:

Ultraviolet radiation-B

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Acknowledgements

The authors would like to acknowledge the staff of the Central Laboratory of Electron Microscopy (LCME), Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil, for the use of their transmission electron microscope. This study was supported in part by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CAPES, Brazil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) and Fundação de Apoio à Pesquisa Cientifica e Tecnológica do Estado de Santa Catarina (FAPESC). The authors are grateful to CAPES for providing a scholarship to Éder C. Schmidt and CNPq-PIBIC for providing a scholarship to Beatriz Pereira. Bouzon ZL, Maraschin M, Horta P.A and Latini A are CNPq fellows. This study is part of the Ph.D. thesis of the first author.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Post-Graduate Program in Cell Biology and Development, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, 88049-900, CP 476, Florianópolis, SC, Brazil

    Éder C. Schmidt

  2. Scientific Initiation-PIBIC-CNPq, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, 88049-900, CP 476, Florianópolis, SC, Brazil

    Beatriz Pereira, Carime L. Mansur Pontes & Rodrigo dos Santos

  3. Department of Botany, Federal University of Santa Catarina, 88010-970, CP 476, Florianópolis, SC, Brazil

    Fernando Scherner & Paulo A. Horta

  4. Laboratório de Bioenergética e Estresse Oxidativo, Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil

    Roberta de Paula Martins & Alexandra Latini

  5. Plant Morphogenesis and Biochemistry Laboratory, Federal University of Santa Catarina, 88049-900, CP 476, Florianópolis, SC, Brazil

    Marcelo Maraschin

  6. Central Laboratory of Electron Microscopy, Federal University of Santa Catarina, 88049-900, CP 476, Florianópolis, SC, Brazil

    Zenilda L. Bouzon

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  1. Éder C. Schmidt
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Correspondence to Éder C. Schmidt.

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Eder C. Schmidt and Beatriz Pereira should be considered as first authors.

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Schmidt, É.C., Pereira, B., Pontes, C.L.M. et al. Alterations in architecture and metabolism induced by ultraviolet radiation-B in the carragenophyte Chondracanthus teedei (Rhodophyta, Gigartinales). Protoplasma 249, 353–367 (2012). https://doi.org/10.1007/s00709-011-0286-1

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