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Boletim do Instituto Oceanográfico

Print version ISSN 0373-5524

Bol. Inst. Oceanogr. vol.39 no.2 São Paulo  1991

https://doi.org/10.1590/S0373-55241991000200003 

ARTIGOS

 

Pigment chromatic adaptation in Cyclotella caspia Grunow (Bacillariophyta)

 

 

Donato Seiji Abe; Sônia Maria Flores Gianesella-Galvão

Instituto Oceanográfico da Universidade de São Paulo (Caixa Postal 9075, 01065-970 São Paulo, SP, Brasil)

 

 


ABSTRACT

The diatom Cyclotella caspia Grunow, isolated from surface waters of the Ubatuba region (São Paulo State, Brazil) was submitted to different light spectral distributions for examination of its adaptative response. Growth rate and the photosynthetic pigments chlorophyll a, chlorophyll c, carotenoids and phaeopigments were measured under white, blue and red light of the same intensity (8 and 20 µE.cm-2.s-1). Growth rate increased under blue light while red light increased chl a concentration. The relative proportion of chl a and carotenoids did not change, demonstrating the absence of complementary chromatic adaptation.

Descriptors: Phytoplankton, Photosynthetic pigments, Chromatic adaptation, light effects, Growth, Chlorophylls, Carotenoids, Cyclotella caspia.


RESUMO

A diatomácea Cyclotella caspia Grunow, isolada de águas superficiais da região de Ubatuba (Estado de São Paulo, Brasil), foi submetida a diferentes intervalos espectrais de luz com a finalidade de se examinar sua resposta adaptativa. Foram medidos a taxa de crescimento e os pigmentos fotossintéticos clorofila a, clorofila c, carotenóides e feopigmentos, sob luz branca, azul e vermelha de mesmas intensidades (8 e 20 µE.cm-2.s-1). A taxa de crescimento aumentou sob luz azul, sendo que a concentração de clorofila a aumentar sob luz vermelha. A proporção relativa de clα e carotenóides não variou, demonstrando a ausência de adapatação cromática complementar.

Descritores: Fitoplâncton, Pigmentos fotossintéticos, Adaptações cromáticas, Efeitos da luz, Crescimento, Clorofilas, Carotenoides, Cyclotella caspia.


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

Acknowledgements

We wish to thank Dr. G. R. Hasle for the species identification, Dr. E. Aidar for the facilities at the Algae Culture Lab, and Dr. R. Owen and two anonymous reviewers for comments on earlier drafts.

 

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(Manuscript received 20 January 1991; revised 5 November 1991; accepted 7 November 1991)

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