laf1 seedlings are specifically impaired in FR-induced de-etiolation. (A) Hypocotyl lengths of laf1 compared with WT (Ler), phyA, and phyB under white (W; 15 μmole/m2 sec), far-red light (FR; 3 μmole/m2 sec), red light (R; 35 μmole/m2 sec) conditions and darkness (D). Error bars show standard deviations. (B) Phenotypes of laf1. Seedlings of WT (Ler), laf1, phyA, and phyB were grown for 4 d either in complete darkness under FR (3 μmole/m2 sec) or under R light (35 μmole/m2 sec). Bar, 10 mm.