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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.


Growth curve of G. theta cells in shaken (closed circles) and air-bubbled (open circles) batch cultures. Cultures of one litre were started with the same number of cells (~105); cell number was measured in triplicate.
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Figure 1: Growth curve of G. theta cells in shaken (closed circles) and air-bubbled (open circles) batch cultures. Cultures of one litre were started with the same number of cells (~105); cell number was measured in triplicate.

Mentions: Growth of G. theta cells in shaking batch culture (12h/12h day/night irradiance rhythm) was monitored over a period of 13 d; G. theta had a doubling time of 34h in its logarithmic phase (Days 2–6). However, already from Day 6 the growth rate slowed down and the culture entered the stationary phase (Fig. 1); characteristic time points are Day 2 (early logarithmic phase), Day 6 (turning point to stationary phase), Day 9 (early stationary phase), and Day 13 (late stationary phase). Cultures that were not shaken, but instead bubbled with air, had reduced growth rate and entered the stationary phase 2–3 d later, however, at roughly the same cell density compared with the shaken culture (Fig. 1). The growth curve of G. theta was compared with Rhodomonas salina, a related cryptophyte, often referred to as the model cryptomonad. Under the same growth conditions like G. theta, the growth of R. salina remained in logarithmic phase throughout the whole experimental period of 14 d (data not shown).


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)

Growth curve of G. theta cells in shaken (closed circles) and air-bubbled (open circles) batch cultures. Cultures of one litre were started with the same number of cells (~105); cell number was measured in triplicate.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

Figure 1: Growth curve of G. theta cells in shaken (closed circles) and air-bubbled (open circles) batch cultures. Cultures of one litre were started with the same number of cells (~105); cell number was measured in triplicate.
Mentions: Growth of G. theta cells in shaking batch culture (12h/12h day/night irradiance rhythm) was monitored over a period of 13 d; G. theta had a doubling time of 34h in its logarithmic phase (Days 2–6). However, already from Day 6 the growth rate slowed down and the culture entered the stationary phase (Fig. 1); characteristic time points are Day 2 (early logarithmic phase), Day 6 (turning point to stationary phase), Day 9 (early stationary phase), and Day 13 (late stationary phase). Cultures that were not shaken, but instead bubbled with air, had reduced growth rate and entered the stationary phase 2–3 d later, however, at roughly the same cell density compared with the shaken culture (Fig. 1). The growth curve of G. theta was compared with Rhodomonas salina, a related cryptophyte, often referred to as the model cryptomonad. Under the same growth conditions like G. theta, the growth of R. salina remained in logarithmic phase throughout the whole experimental period of 14 d (data not shown).

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.