Effect of gibberellic acid (AG3) on the germination of seeds of Thymus satureioides L and Lavandula dentata

Although morocco has long been considered a reservoir rich in medicinal and aromatic plants,this heritage is still under exploitation. in fact the diversity of the moroccan seed bank in medicinal and aromatic plants requires a particular interest through the optimization of the production of some species,such as thymus satureioides.l and lavandula dentata. to do this,an experiment was carried out on seeds of these species at the laboratory of biology of plants and microorganisms of the faculty of sciences in oujda to study the effect of gibberellic acid on their germinations. the experimental protocol includes four treatments on thymus satureioides and six treatments on lavandula dentata. the comparison of the different results shows that the treatment of the seeds of thymus satureioides l and lavandula dentata significantly improved the germination's percentage and kinetics. the highest effect observed in the treatment which was treated with 50 ppm ag3 for thymus satureioides.l showed an increase of 27% in the germination's percentage compared to the control and that the seeds of the lavandula dentata treated with gibberellic acid at 1000ppm marked a maximum germination of 67% compared to the control which did not exceed 1%. © 2017,university of mohammed premier oujda morocco.