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Fig. 2 | BMC Biology

Fig. 2

From: Red algae acclimate to low light by modifying phycobilisome composition to maintain efficient light harvesting

Fig. 2

Excitation spectra of PSI fluorescence of L. glaciale. Detected at 720Ā nm (normalised at 570Ā nm) with a 15-nm bandwidth (full-width half maximum) after 9Ā months experimental exposure to different light intensities (350, 80, 20 and 2.5Ā Āµmol photons māˆ’2Ā sāˆ’1) and spectra (shown for reference in the top right panel). Vertical lines indicate the wavelengths used to estimate the light harvesting contributions ofĀ phycourobilin (PUB), phycoerythrobilin (PEB) and phycocyanobilin (PCB). PCB accounts forĀ only 70% of the indicatedĀ chlorophyll-a fluorescence intensity recorded after excitation at 620Ā nm, with the remaining 30% coming from the direct excitation of chlorophyll-a (see Additional File 1: Figure S1). Data presented as meanā€‰Ā±ā€‰SE, nā€‰=ā€‰3ā€“4 individualsĀ (from different aquaria)Ā per treatment

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