Abstract:

Gibberllins(GAs) plays important roles in cotton fiber development .DELLA proteins, a negative regulator in the signaling pathway of GAs. The gene GbGAI enconding the DELLA protein in Gossypium hirsutum L, was isolated and cloned . The typical domains of DELLA proteins were also found in the GbGAI proteins .over-express lines of GbGAI were got by dipping the 35S:GbGAI vector into the wild type Arabidopsis Columbia, and these lines showed phynotypes such like late flowering ,severely dwarf et al. Which exactly were same to the GAs deficient or insensitive mutant.