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Presence of state transitions in the cryptophyte alga Guillardia theta.

Cheregi O, Kotabová E, Prášil O, Schröder WP, Kaňa R, Funk C - J. Exp. Bot. (2015)

Bottom Line: These state transitions were triggered by blue light absorbed by the membrane integrated chlorophyll a/c antennae, and green light absorbed by the lumenal biliproteins was ineffective.It is proposed that state transitions in G. theta are induced by small re-arrangements of the intrinsic antennae proteins, resulting in their coupling/uncoupling to the photosystems in state 1 or state 2, respectively.G. theta therefore represents a chromalveolate algae able to perform state transitions.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Umeå University, SE-90187 Umeå, Sweden.

No MeSH data available.


Related in: MedlinePlus

Connectivity of PSII reaction centres (p, open squares) and effective antenna cross-section of PSII (σ, closed squares) measured in G. theta cells in dependence of the culture age. All measurements were performed in triplicate and error bars represent standard deviation. Fluorescence during single-turnover was detected at 680–700nm.
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Figure 4: Connectivity of PSII reaction centres (p, open squares) and effective antenna cross-section of PSII (σ, closed squares) measured in G. theta cells in dependence of the culture age. All measurements were performed in triplicate and error bars represent standard deviation. Fluorescence during single-turnover was detected at 680–700nm.

Mentions: The effective PSII antenna size (σPSII) and connectivity of PSII reaction centers (p) was measured by fast repetition rate fluorometry (FRRF). In the logarithmic growth phase, the p-value was high (around 0.3, see Fig. 4), indicating that PSII centres share a common antenna; this interconnection was lost in the stationary phase (p<0.1 in Fig. 4). At the same time, the effective antenna size of PSII significantly increased by 25% from G. theta cultures growing in logarithmic phase (σPSII of ~330 Å2) to stationary phase (σPSII of ~430 Å2) (Fig. 4); more chlorophyll molecules were effectively connected with PSII in the stationary phase.


Presence of state transitions in the cryptophyte alga Guillardia theta.

Cheregi O, Kotabová E, Prášil O, Schröder WP, Kaňa R, Funk C - J. Exp. Bot. (2015)

Connectivity of PSII reaction centres (p, open squares) and effective antenna cross-section of PSII (σ, closed squares) measured in G. theta cells in dependence of the culture age. All measurements were performed in triplicate and error bars represent standard deviation. Fluorescence during single-turnover was detected at 680–700nm.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4588893&req=5

Figure 4: Connectivity of PSII reaction centres (p, open squares) and effective antenna cross-section of PSII (σ, closed squares) measured in G. theta cells in dependence of the culture age. All measurements were performed in triplicate and error bars represent standard deviation. Fluorescence during single-turnover was detected at 680–700nm.
Mentions: The effective PSII antenna size (σPSII) and connectivity of PSII reaction centers (p) was measured by fast repetition rate fluorometry (FRRF). In the logarithmic growth phase, the p-value was high (around 0.3, see Fig. 4), indicating that PSII centres share a common antenna; this interconnection was lost in the stationary phase (p<0.1 in Fig. 4). At the same time, the effective antenna size of PSII significantly increased by 25% from G. theta cultures growing in logarithmic phase (σPSII of ~330 Å2) to stationary phase (σPSII of ~430 Å2) (Fig. 4); more chlorophyll molecules were effectively connected with PSII in the stationary phase.

Bottom Line: These state transitions were triggered by blue light absorbed by the membrane integrated chlorophyll a/c antennae, and green light absorbed by the lumenal biliproteins was ineffective.It is proposed that state transitions in G. theta are induced by small re-arrangements of the intrinsic antennae proteins, resulting in their coupling/uncoupling to the photosystems in state 1 or state 2, respectively.G. theta therefore represents a chromalveolate algae able to perform state transitions.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Umeå University, SE-90187 Umeå, Sweden.

No MeSH data available.


Related in: MedlinePlus