Fig. 4. Expression of ZFP8, GIS2 and GL1 in response to GA and cytokinin treatments. Left: expression of GIS, ZFP8, GIS2, GL1 and primary response regulator ARR5 in inflorescence organs of Arabidopsis plants 2 hours after 6-benzylaminopurine applications (100 µM) to wild-type plants. Middle: expression of GIS, GL1 and ARR5 in response to 6-BA applications (100 µM) in the spy-3 mutant background. Right: induction by GA of ZFP8, GIS2 and GL1 expression in the inflorescence of ga1-3 mutants 4 hours after treatment. Black bars: mock treatments; grey bars: hormone treatments. Transcript levels were measured by real-time PCR and the values represent ratios of normalized levels to controls.