1. In rice GID1 (gibberellin insensitive dwarf 1) is a intracellular soluble GA receptor.
After binding to GA it mediates the degradation of repressors of GA responses. Aleurone GA dependent alpha-amylase induction is absent in gid1-1 mutants in rice.
Ueguchi-Tanaka et al., 2007

2. BUT: Experiments in oat and barley do not fit to that model.
a. GA covalently bound to agarose beads induce alpha-amylase production in oat aleurone protoplasts but not in cells with an intact wall.
(Hooley et al., 1999).
b. Microinjected GA is not able to induce alpha-amylase expression in barley aleurone protoplast although extracellularly added GA did.
(Jilroy and Jones, 1994)