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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.


(A) Cell size (open squares) and amount of chlorophyll per cell (closed squares) of a G. theta batch culture grown under standard conditions (shaking) for 2 weeks. Triplicates were measured per time point. (B) Whole cells absorption spectra of a culture in logarithmic growth phase (Day 2, black line), at its turning point (Day 6, dotted black line), and in stationary phase (Day 13, grey line).
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Figure 2: (A) Cell size (open squares) and amount of chlorophyll per cell (closed squares) of a G. theta batch culture grown under standard conditions (shaking) for 2 weeks. Triplicates were measured per time point. (B) Whole cells absorption spectra of a culture in logarithmic growth phase (Day 2, black line), at its turning point (Day 6, dotted black line), and in stationary phase (Day 13, grey line).

Mentions: The diameter of individual G. theta cells increased gradually with culture age (Fig. 2A); when the cells entered the stationary phase at Day 6, with decreased doubling time the G. theta cells continued to grow in size. The total amount of chlorophyll per cell decreased during the logarithmic phase, but remained constant in the stationary phase (Fig. 2A). The amount of Chl a decreased by 43% from 1.34 pg/cell (Day 2 after culture started) to 0.750 pg/cell (in 13-d-old cultures), meanwhile Chl c only decreased from 0.234 pg/cell (Day 2) to 0.156 pg/cell (Day 13), resulting in a decreased Chl a/Chl c ratio by 13% during the experiment.


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)

(A) Cell size (open squares) and amount of chlorophyll per cell (closed squares) of a G. theta batch culture grown under standard conditions (shaking) for 2 weeks. Triplicates were measured per time point. (B) Whole cells absorption spectra of a culture in logarithmic growth phase (Day 2, black line), at its turning point (Day 6, dotted black line), and in stationary phase (Day 13, grey line).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

Figure 2: (A) Cell size (open squares) and amount of chlorophyll per cell (closed squares) of a G. theta batch culture grown under standard conditions (shaking) for 2 weeks. Triplicates were measured per time point. (B) Whole cells absorption spectra of a culture in logarithmic growth phase (Day 2, black line), at its turning point (Day 6, dotted black line), and in stationary phase (Day 13, grey line).
Mentions: The diameter of individual G. theta cells increased gradually with culture age (Fig. 2A); when the cells entered the stationary phase at Day 6, with decreased doubling time the G. theta cells continued to grow in size. The total amount of chlorophyll per cell decreased during the logarithmic phase, but remained constant in the stationary phase (Fig. 2A). The amount of Chl a decreased by 43% from 1.34 pg/cell (Day 2 after culture started) to 0.750 pg/cell (in 13-d-old cultures), meanwhile Chl c only decreased from 0.234 pg/cell (Day 2) to 0.156 pg/cell (Day 13), resulting in a decreased Chl a/Chl c ratio by 13% during the experiment.

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.