Relative expression levels of the <i>hsp</i> genes and <i>mcyE</i> gene of <i>P</i>. <i>agardhii</i> from control (T₀) to high light stress (1 h to 24 h).

<p>Relative mRNA expression of <i>hsp</i> genes was normalized against three RGs: <i>rsh</i>, <i>rpoD</i> and <i>gltA</i>. (A): unchanged expression; (B): <4 fold up-regulated; (C): >4 fold up-regulated. Error bars correspond to the standard deviation, including two technical replicates for two independent biological samples. An asterisk indicates a significant difference <i>versus</i> control (T₀) *: <i>p</i><0.05. Circles indicate a significant difference in the expression level between the WT and the mutant strains; °°: <i>p</i><0.01; °°°: <i>p</i><0.001.