Figure 4.

Relative transcript levels of genes encoding components of photosystem I and photosystem II after a 1-h exposure to high light compared to standard conditions. The transcript level of genes encoding components of PS II (light gray) and PS I genes (dark gray) are displayed as the ratio of the relative transcript abundances for high-light-treated cells compared to the mean of three samples for standard conditions. A value of 1 represents an equal mRNA level under both conditions; values greater than 1 indicate an increase in relative transcript abundance; and values lower than 1 represent a decrease in relative transcript abundance after a 1-h exposure to high light.