Effect of gibberellin and methyl jasmonate on the vase age and qualitative characteristics of rose leaves and flowers Rosa hybrida cv. Red Intuition – DELstriro

The experiment was conducted at the Agricultural Research Station of the College of Agriculture, University of Kufa, during the spring season 2024 to study the effect of spraying gibberellic acid (0, 75, 150, and 225 mg L-1) and methyl jasmonate (0, 50, 100, and 200 mg L-1) in the qualitative characteristics of flowers and the flowering age of rose plants. A factorial experiment was carried out using a Randomized Complete Block Design (RCBD) with three replications. The results showed that the vase age and flower stem diameter increased when plants were sprayed with gibberellic acid at concentrations of 75 and 150 mg L-1 with 200 mg L-1 of methyl jasmonate, while an improvement was observed in flower diameter and carotenoid content of leaves when treated with gibberellic acid at a concentration of 75 mg L-1 with 100 mg L-1 of methyl jasmonate. As for the number of petals, an increase in their number was observed when spraying with gibberellic acid at a concentration of 150 mg L-1 with 100 mg L-1 of methyl jasmonate, while the higher concentrations of 225 mg L-1 of gibberellic acid in combination with 200 mg L-1 methyl jasmonate led to an inhibition in the hydrogen peroxide content of leaves. It could be concluded from this study the role that plant growth regulators play in supporting plant growth, which has a positive impact on the state of plant growth and improving the qualitative characteristics of flowers, but this requires further studies on this subject in order to increase interest and encourage the spread of cultivation and circulation of cut flowers as an economic resource for the region.