Fig. 1.

Light inhibition of seed germination in Aethionema arabicum accession CYP. (A) Eight-week-old A. arabicum TUR (Turkey) and CYP (Cyprus) plants grown in a growth chamber. (B) Percentage of germinating seeds kept in darkness or under 100 μmol m⁻² s⁻¹ white light, scored over time. (C) Percentage of germinating seeds kept at various light intensities: (0.8, 1.74, 4, 9.2,23, 62, 80, 100, 150 and 180 μmol m⁻² s⁻¹ white light) or in darkness (indicated as 0 μmol m⁻² s⁻¹), scored after 6 d. (D) Percentage of germinating TUR seeds kept in darkness or under 1600 μmol m⁻² s⁻¹ white light, scored over time. (E) Percentage of germinating seeds in continuous white, red, blue, or far-red light, dark, or exposed to 5 min far-red light followed by darkness, scored after 6 d. (F) Percentage of germinating CYP seeds after various light treatments. The left panel indicates the treatment; the right panel indicates the percentage of germinating seeds, scored after 6 d. Red, dark red, and cream rectangles indicate red, far-red, and white light exposure, respectively. Grey bars indicate dark periods. Short and long red/far-red rectangles indicate 5 min and 24 h exposure, respectively. (G) Percentage of germinating seeds from different A. arabicum accessions and closely related species, kept in the dark (black columns), light (yellow columns), or in the dark after a 5 min far-red pulse at imbibition (red columns), scored after 6 d. Error bars represent SD (three independent replicates).