Figure 4.

Inhibition of hypocotyl growth by high, compared to low blue/green ratios within the range of natural radiation. Four-day-old seedlings of the phyA phyB mutant (A) or of the wild type (B) grown under different irradiances of continuous light of two contrasting blue/green ratios in controlled conditions. Hypocotyl length of the phyA phyB cry1 triple mutant under log blue light equivalent of 0.8 was 0.99 ± 0.01 and 0.89 ± 0.02 for blue/green ratios of 1.1 and 0.5, respectively. Data are means and se (whenever larger than the symbols) of eight replicate boxes. Ler, Landsberg erecta. [See online article for color version of this figure.]