Investigating the effects of several plant growth regulators on growth characteristics, chlorophyll content and amounts of the elements in Euphorbia lactea f. cristata

Phytohormones are responsible for regulating and coordinating processes that occur in different parts of plants. The natural growth of a plant is regulated more by the interaction of stimulating and inhibiting phytohormones. Euphorbia lactea a member of Euphorbiaceae is a beautiful and popular ornamental plant with high demand and good market. Therefore, current research was carried out to improve the vegetative traits of this plant in a completely randomized design with three replications in greenhouse conditions in the year 2017. Effect of twelve experimental treatments were investigated which were comprised of control, 2,4-D (25, 50 and 100 mg/l), TDZ (5, 10 and 20 mg/l), GA3 (100, 200 and 400 mg/l) and a combination of 2,4-D and TDZ (5 and 10 mg/l). Treatments were applied eight times at intervals of seven days on the scions of the grafted plants. In the treatments with 2,4-D, the growth form of the scion was as granular bumps, in TDZ, was sporadically, in GA3, was as antler of a hart and in 2,4-D plus TDZ, it was a combination of granular and cone protrusions. Based on the results, the highest final weight of the scion was obtained from 400 mg/l GA3 treatment with average of 20.1 g. Also, among different plant growth regulators treatments, the highest amount of total chlorophyll content was achieved from 100 mg/l GA3 treatment with the mean of 0.94 mg/g fresh weight. K and P were maximum in 5 mg/l TDZ. Calcium amount was also maximum in 400 mg/l GA3 treatment.