Truncated inactive FRIGIDA-like 1 protein. In cv. Columbia and cv. Landsberg erecta, either FRL1 or FRL2, but not both, is functional and required for FRI-mediated up-regulation of FLC (PubMed:17056759). Belongs to the Frigida family. In cv. Columbia, FRL1 (AC Q9FFF1) is full-length and functional.