Table 2 Analysis of pigment composition and non-photochemical quenching (NPQ) capacity of wild type (wt) and the four bi-allelic PtAUREO1a knockout strains (6, 8, 9 and 11). Chlorophyll a (Chl a) was determined photometrically (wild type n=5, bi-allelicmutants n=3), whereas the other pigmentswere assayed by HPLC (n=2). Pigmentswere isolated from strains being inmid exponential growth phase and having comparable Chl a per culture-volume ratios. NPQwasmeasured by PAM fluorometry (n=3). Statistical significant differences compared to the wild type were calculated using Student's t-test (*: p b 0.01; **:p b 0.001). XC pool: xanthopyll cycle pool (diadinoxanthin + diatoxanthin).
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