Changes of the delayed fluorescence characteristics in Spirulina, Anabaena and Chlorella in response to chromatic adaptatíon and irradiance

Title:

Changes of the delayed fluorescence characteristics in Spirulina, Anabaena and Chlorella in response to chromatic adaptatíon and irradiance

Creator:

Znak, N.Y. and Morgun, V.N.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:83450e70-550b-4ffa-a140-f94ab9ce3f0e
uuid:83450e70-550b-4ffa-a140-f94ab9ce3f0e
urnnbn:urn:nbn:cz:aba007-000fn3

Subject:

chlorophyll, reaction centres, phycobilins, photosystem 2/ photosystem 1, photosynthetic electron transport, fluorescence induction, fluorescence emission spectra, and diuron

Type:

model:internalpart and TEXT

Format:

print

Description:

Effíciency of the energy transformation for CO2 fixation (E), and kinetics of the initial 02-mediated electron transport of Spimlina platemis (Gom.) Geitl. and Chlorella vulgaris Beijerinck cells were measured after adaptation to various growth irradiances (7) by means of the delayed fluorescence (DF) induction curves. Maxima of the membrane potential expenses during induction period were observed at I half saturating oxygen evolution; they were shifted according to growth 1 remaining higher in Spirulina than in Chlorella. The alterations of absorbance and fluorescence spectra at 25 oC after adaptation to / demonstrated changes in composition of pigments of algae, created to compensate for the imbalance in radiation absorption between the two photosystems. For Spirulina cells, the value of E was higher after growing under low /, or under blue radiation absorbed mainly by photosystem (PS) 1 (400-500 nm) with excitation by yellow (570 nm) radiation. For Chlorella cells, it was also higher after growing under low I. Under such conditions the half-rise time for DP-phase of DF induction curve decreased, which reflected an acceleration of kinetics of the initial electron transport between photosystems. An opposite situation was observed with Spirulina cells grown under high I or yellow radiation, and Chlorella cells from high I. Enhancement of effective PS2/PS1 ratio associated with decrease of reaction centre (RC) 2/RCl stoichiometry may be a cause of the increase of E and high membrane energization under saturating I in algae adapted to low 1.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

117-125 and 119-127

Source:

Photosynthetica | 1995 Volume:31 | Number:1

Harvested from:

CDK

Metadata only:

false