Gibberellic acid (GA) plays an important role in many essential plant growth and development processes, including seed
germination, stem elongation, leaf expansion and reproductive
development. GA is widely regarded as a growth-promoting compound that positively regulates processes such as seed germination,stemelongation, leaf expansion, flower and fruit development andfloral transition (Razem et al., 2006).
control and treated vines. In each cultivar, intrinsic water use efficiency (WUEi ) increased at reduced
stomatal conductance. GA3 treatment resulted in favourable values of WUEi as expected for cultivar
‘Kadarka’ (group of convarietas pontica).WUEi was significantly (P < 0.05) lower in the GA3 treated vines
compared to the controls in most of the varieties irrespective of different ecogeographical groups.