Temporal characteristics of chlorophyll fluorescence quenching and dissolved oxygen concentration as indicators of photosynthetic activity in Chlorella emersonii

Title:

Temporal characteristics of chlorophyll fluorescence quenching and dissolved oxygen concentration as indicators of photosynthetic activity in Chlorella emersonii

Creator:

El Khachia, N.-E., O'Mongain, E., and Collins, A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2c26e802-e2d9-4713-9c49-eab3378a5300
uuid:2c26e802-e2d9-4713-9c49-eab3378a5300
issn:0300-3604
doi:10.1007/s11099-008-0014-z

Subject:

algal blooms, DCMU, non-photochemical quenching, photosystem 2, and zero oxygen tablets

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

A simple chlorophyll fluorescence (CF) measuring system has been implemented to study temporal characteristics of chlorophyll fluorescence induction (CFI) in dark-adapted freshwater algal cultures of Chlorella emersonii. There were two different decay time constants describing the CF quenching: τ0 (the faster) and τ1 (the slower) with amplitudes A0 and A1, respectively. The relative amplitude of the faster quenching component decreased once the sample was subject to deprivation from dissolved oxygen (DO). The DO concentration of samples was monitored to validate the effects of deprivation from air contact for up to 7 d and to the effect of adding DCMU to the culture (herbicide for blocking electron transport of photosystem 2). CFI analysis and DO measurements showed that the relative amplitude of A0 to (A0 + A1) and the DO concentration can be used as an indication of relative photosynthetic activity, thus allowing for the possibility to classify the physiological state of algal blooms into active and inactive states. and N. E. El Khachia, E. O'Mongain, A. Collins.

Language:

Multiple languages

Rights:

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

Coverage:

79-83

Source:

Photosynthetica | 2008 Volume:46 | Number:1

Harvested from:

CDK

Metadata only:

false