GA has also been used in viticulture as a regulatory compound.
Early experiments have shown that different concentrations of
GA3 delay bud-break in cultivars ‘Riesling’ and ‘Velteliner Grün’,
as well as some rootstock varieties (Alleweldt, 1959, 1961). PrebloomGA3
treatment leads to bunch expansion resulting in a looser
architecture of clusters. This impact of GA3 is now used in table
grape production (Van der Merwe et al., 1991; Williams and Ayars,
2005). The impact of GA treatment on the grape cluster depends
largely on the concentration and development stage when used.
Adverse effects could include the inhibition on inflorescence primordia
development.