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Effects of light quality on chlorophyll-forms Ca 684, Ca 690 and Ca 699 of the diatom Phaeodactylum tricornutum by Lise Caron; Henri Jupin; Claire Berkaloff is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Effects of light quality on chlorophyll-forms Ca 684, Ca 690 and Ca 699 of the diatom Phaeodactylum tricornutum about?

Colored light modifies the relative concentration of chlorophyll-forms of the diatom Phaeodactylum tricornutum compared to white-light control. No change in the ratio carotenoids/chlorophylls was observed after 4 days exposure to green light (max i 530 nm), blue light (max: 470 nm) or red light (h > 650 nm) of same intensity. However, the absorption spectra were modified, the content in Ca 684, Ca 690, Ca 699 forms increased in red and green light cultures and photosynthetic unit size of PS II decreased by 30% in green and blue light cultures. Fluorescence emission and fluorescence excitation spectra according to the Butler and Kitajima method (1975) were carried out for each culture. Ca 669 form was predominant in the two photosystems. The newly appeared far red forms fluoresce at 715 nm like PS I forms. We conclude that these new forms originated in a rearrangement of PS II forms. They do not transmit excitation energy to reaction center of PSI and are disconnected from the other chlorophyll-forms of the photosynthetic antennae.

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Author

Lise Caron; Henri Jupin; Claire Berkaloff

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0166-8595)

Published

1983

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)