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JPR Advance Access originally published online on February 6, 2009
Journal of Plankton Research 2009 31(5):481-488; doi:10.1093/plankt/fbp006
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Effects of light intensity and light quality on growth and circadian rhythm of saxitoxins production in Cylindrospermopsis raciborskii (Cyanobacteria)

Ronaldo Leal Carneiro1,*, Maria Elisângela Venâncio dos Santos1, Ana Beatriz Furlanetto Pacheco2 and Sandra Maria Feliciano de Oliveira e Azevedo1

1 Laboratory of Cyanobacterial Ecophysiology and Toxicology, Institute of Biophysics Carlos Chagas Filho, Health Sciences Center, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil 2 Genomic Unit, Institute of Biophysics Carlos Chagas Filho, Health Sciences Center, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

* CORRESPONDING AUTHOR: rleal{at}biof.ufrj.br

Received on September 3, 2008; accepted on January 9, 2009


  Abstract

Effects of light intensity and light quality on saxitoxin and neosaxitoxin production by Cylindrospermopsis raciborskii (Woloszynska) Seenaya and Subba Raju (strain T3) were investigated in batch culture conditions. Three light intensities (50, 100 and 150 µmol photons m–2 s–1) and three light qualities (white and blue 470 nm and red 630 nm) were used. Growth rates were higher under 100 and 150 when compared to 50 µmol photons m–2 s–1 (control condition). Saxitoxin (STX) and neosaxitoxin (NSTX) production showed an increase during the early stationary phase under 50 µmol photons m–2 s–1 (12 days). Higher concentrations of STX and NSTX were observed in cells under 100 µmol photons m–2 s–1. Production of these toxins showed a circadian rhythm synchronized with light:dark (L:D) cycle and also with a period of 24 h under the three light intensities tested. The circadian rhythm of STX and NSTX production under white light conditions was confirmed. Red light induced the loss of circadian rhythm in NSTX production. These data demonstrate a circadian rhythm in saxitoxins production modulated by light.

Corresponding editor: William Li


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