Effects of plant growth regulators on the plant height and quantitative properties of Narcissus tazetta

Abstract

The effects of flurprimidol, paclobutrazol, and ethephon treatment as soil drench on plant height and quantitative and other properties of native narcissus (Narcissus tazetta L.) plants grown in pots were investigated. When the plants were 7-10 cm tall, flurprimidol and paclobutrazol at 0, 1, and 2 mg/pot and ethephon at 0, 37.5, and 75 mg/pot were applied as soil drenches. The effects of plant growth retardant treatments on plant height, leaf length, time of flowering, number of flowers, and flower life were determined. In addition, quantitative measurements (leaf area ratio, specific leaf area, leaf thickness, leaf weight ratio, and stem weight ratio) were analyzed in native narcissus. When narcissus grown in pots in the greenhouse reached the sale stage, the plants were taken to the laboratory at 20 °C to evaluate the postproduction life and quality of pot plants. Flurprimidol, paclobutrazol, and ethephon shortened plant height. The shortest plant height was obtained from 2 mg/pot paclobutrazol; plant height was 5.42 cm, 65% shorter than the untreated controls. Chemical applications also shortened leaf length. The shortest leaf length (13.25 cm) was obtained from the 2 mg/ pot paclobutrazol treatment. The chemical treatment decreased the leaf area ratio and specific leaf area, but increased the leaf thickness and leaf weight ratio compared to the control plants. The effects of treatments on plant height continued in laboratory (home-office) conditions after production. The shortest plant height (9.5 cm) was obtained from the 2 mg/pot paclobutrazol treatment, whereas the height of untreated control plants was 24.25 cm during the postproduction life of pot plants.

Phytomelatonin: An overview of the importance and mediating functions of melatonin against environmental stresses

“…These phytohormones, at very low doses, regulate various physiological functions at all developmental stages of plants, such as germination, rooting, flowering, dormancy, and so on. Therefore, as endogenous signals, such compounds act both temporally and spatially (Demir & Celikel, 2019; Gundesli et al, 2019; Sajjad et al, 2017). Melatonin is a bio‐molecule which is widely studied, with the molecular name of N ‐acetyl‐5‐methoxytryptamine.…”

A Cytokinin Analog Thidiazuron Suppresses Shoot Growth in Potted Rose Plants via the Gibberellic Acid Pathway

“…Stem elongation was inhibited in gibberellin-deficient Arabidopsis mutants (Sun and Kamiya, 1994;Chiang et al, 1995), and the gibberellin inhibitor paclobutrazol suppresses growth in a wide range of plant species by decreasing the concentrations of endogenous gibberellins (Tsegaw et al, 2005). Gibberellin inhibitors have been used during production to control the plant height after harvest (Miller, 2012) and in the production of potted bulbous flowers (Demir and Çelikel, 2019). Since the inhibition of extension growth in TDZ-treated roses did not appear to be the result of stimulated ethylene production, we investigated the effects of TDZ on expressions of genes encoding enzymes involved in gibberellin biosynthesis and degradation (catabolism).…”

“…The lower light conditions in homes and offices could result in an increase in plant height and a reduction of postharvest quality. To provide compact plants, growers apply plant growth regulators, such as ethylene (released from ethephon) (Çelikel and Demir, 2019), or more commonly, inhibitors of gibberellin biosynthesis (such as flurprimidol, ancymidol, and paclobutrazol) (Miller, 2012;Demir and Çelikel, 2019), to suppress extension growth after production. Our findings that the anti-yellowing effect of TDZ was accompanied by a marked reduction of elongation growth are therefore of considerable practical interest.…”

Gibberellin Inhibitor Treatments Before Planting Control Plant Height of Narcissus tazetta by Affecting Growth Parameters

“…It is important to know the growing techniques of indoor plants such as plant height control especially in bulbous flowers (Çelikel, 2015). Plant height may be controlled by physical or chemical methods with plant growth retardants mostly gibberellin inhibitors (Çelikel et al, 2016;Demir and Çelikel, 2019).…”

“…Ahmad Nazarudin et al (2007), reported that paclobutrazol treatments caused the control of plant height by decreasing the leaf area and leaf expansion. Demir and Çelikel (2019) used gibberellin inhibitors as soil drench to investigate the plant height control of Narcissus tazetta grown naturally in Black Sea Region of Turkey. However, there is no previous study on bulb soak treatments of inhibitors in this species.…”