Effect of priming with gibberellic acid on acorn germination and growth of plants of Quercus robur and Q. rubra (Fagaceae)

The effect of pre-sowing priming with gibberellic acid (GA3) solution (50 mg/L) on acorn germination and growth characteristics 47-day-old plants Quercus robur Q. rubra was studied under laboratory conditions. varied depending the oak species development phase plants. After priming, 86% acorns germinated that exceeded control by 25%, while number sprouted at level amounted to 85%. were divided into three groups: (1) cracked pericarp main root; (2) seedlings formed epicotyl apical bud; (3) unopened true leaves juvenile type. two open leaves. In robur, caused decrease biomass in cotyledons, no visible changes found for those rubra. An increase characteristics, fresh dry accumulation noted all whereas thickening shoots observed only second group. Instead, hormone treatment led inhibition processes both groups. general, GA3 enhanced stimulated and, conversely, slowed Exogenous did not eliminate syndrome unfriendly species, but improved viability increased seedlings/shoots.