Figure 3.

Characterization of different low-light (LL)- and high-light (HL)-adapted Prochlorococcus ecotypes grown at 20 μmol Q m⁻²⋅s⁻¹. (A) Excitation fluorescence spectra of whole cells normalized to the divinyl-Chl a peak (444 nm). The variable height of the second peak, mainly monovinyl-Chl b (468 nm) for NATL2a and divinyl-Chl b (478 nm) for the other strains, indicates the widely different Chl b to Chl a ratios between strains. (B) Pattern of amplified pcb fragments obtained on polyacrylamide gels after cleavage by HaeIII. Lane M, size markers.