Epistatic analyses with positively acting Arabidopsis light signaling factors. Fluence rate response curves for the inhibition of hypocotyl elongation are shown for seedlings grown under continuous far-red light for 3 d after germination induction. Relative hypocotyl lengths were calculated in relation to the lengths of dark-grown seedlings for each line. Each data point represents the mean of two independent experiments ± se with at least 30 seedlings. A, Ler wild type, eid3, hy5-1, and eid3 hy5-1 mutants. B, Ler wild type, Col wild type, eid3, fhy3-1, and eid3 fhy3-1 mutants. C, Ler wild type, eid3, hfr1-2, and eid3 hfr1-2 mutants. D, Ler wild type, Nossen (No) wild type, eid3, far1-3, and eid3 far1-3 mutants.