Abstract
Chromatic photoacclimation and photosynthesis were examined in two strains of Acaryochloris marina (MBIC11017 and CCMEE5410) and in Synechococcus PCC7942. Acaryochloris contains Chl d, which has an absorption peak at ca 710 nm in vivo. Cultures were grown in one of the three wavelengths (525 nm, 625 nm and 720 nm) of light from narrow-band photodiodes to determine the effects on pigment composition, growth rate and photosynthesis: no growth occurred in 525 nm light. Synechococcus did not grow in 720 nm light because Chl a does not absorb effectively at this long wavelength. Acaryochloris did grow in 720 nm light, although strain MBIC11017 showed a decrease in phycobilins over time. Both Synechococcus and Acaryochloris MBIC11017 showed a dramatic increase in phycobilin content when grown in 625 nm light. Acaryochloris CCMEE5410, which lacks phycobilins, would not grow satisfactorily under 625 nm light. The cells adjusted their pigment composition in response to the light spectral conditions under which they were grown. Photoacclimation and the Q y peak of Chl d could be understood in terms of the ecological niche of Acaryochloris, i.e. habitats enriched in near infrared radiation.
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Abbreviations
- Chl:
-
Chlorophyll
- LED:
-
Light emitting diode
- NIR:
-
The near infrared light
- PAR:
-
Photosynthetically active radiation
- PBS:
-
Phycobilisomes
- PS:
-
Photosystem
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MC holds an Australian Research Council (ARC) QEII fellow and wishes to thank ARC for the financial support.
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11120_2009_9466_MOESM1_ESM.jpg
Figure supplementary 1. Growth rate. Growing rate was determined by monitoring the A708 absorbance (Chl d Q y peak) and the fitting curve was modelled using an exponential curve equation (as in the figure). Grey dashed line, CCMEE5410 grown in 720 nm light; Black dashed line, MBIC11017 grown in 720 nm light; Black solid line, Acaryochloris MBIC11017 grown in 625 nm light and grey solid line, Acaryochloris CCMEE5410 grown in 625 nm. (JPG 326 kb)
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Duxbury, Z., Schliep, M., Ritchie, R.J. et al. Chromatic photoacclimation extends utilisable photosynthetically active radiation in the chlorophyll d-containing cyanobacterium, Acaryochloris marina . Photosynth Res 101, 69–75 (2009). https://doi.org/10.1007/s11120-009-9466-7
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DOI: https://doi.org/10.1007/s11120-009-9466-7