Leila Mohammadi, Saeed Reezi,
Volume 6, Issue 21 (vol 6, no. 21 2017)
Abstract
To evaluate the rooting of New Giunea impatiens (Impatiens hawker stem) cuttings under arbuscular mycorrhiza (Glomus mosseae) and its effect on nutrient elements absorption, an experiment as factorial in complete random design with three replications in the greenhouse was established. Experiment factors were four levels of synergistic mycorrhiza in 0, 11 and 22 percent (as powder) and 20 percent (as solution, v/v). Cutting were collected from seed propagated stock plant (Devine Scarlet Red, F1) and planted in medium mycorrhiza incubated pots contributed in 50% of peat moss, 40% of perlite and 10% percent of rice husk (v/v). One month after planting, rooting percentage, root length, number and volume and root fresh and dry matter were evaluated. Results showed that unless rooting percentage, the significant difference in 0.01 probability observed in all evaluated traits. The most root length and volume (32 cm and 34.66 mm3) and root fresh and dry matter (26.49 and 0.73 g) was related to 22% percent treatment. Five months after planting, other group of rooted cuttings was evaluated for element absorption content. The most leaf nitrogen (2.6%), phosphorus (0.419%), potassium (2.66%), zinc (73.52 mg/kg) and copper (18.77 mg/kg) content observed in 22% treatment. In this experiment mycorrhiza application in medium (as powder) showed better results compared to solution treatment.
Badri Gholamian Dehkordi, Saeed Reezi, Masoud,
Volume 11, Issue 50 (vol. 11, no. 50 2022)
Abstract
The use of growth regulators and light quality change are two methods to improve plant performance. Therefore, a factorial experiment was conducted in a completely randomized design. Factors included three light modes (greenhouse light (control) and LED combination light of white: red: blue as 70: 10: 20 and 40: 40: 20 ratios) and gibberellic acid in four concentrations (0, 20, 40 and 60 mg/l). At the stage of cotyledon emergence, the seedlings were exposed to LED and greenhouse light for 4 months. Gibberellic acid was sprayed on the leaves three times from the end of the third growing month. Based on the results, in the 6- to 8-leaf stage, the highest amount of trapped energy flux (TR0 / RC) was related to greenhouse light and the highest electron transfer flux in each reaction center (ET0 / RC) was observed at the lowest concentration of gibberellic acid (zero) in greenhouse light. The lowest light fluorescence intensity at 50 μs and 2 milliseconds (F0 and Fj) at the lowest gibberellic acid concentration under 40: 40: 20 and the lowest light fluorescence intensity at 60 ms, variable and maximum fluorescence (Fi, FV and Fm) were obtained in the same light regime. The highest content of chlorophyll b and total chlorophyll was obtained in 40: 40: 20 light mode and the highest amount of root fresh and dry weight, root length and volume in the greenhouse and the highest leaf area in the greenhouse and a concentration of 40 mg/l gibberellic acid were observed. Although the use of LED light regimes and high concentrations of gibberellic acid was beneficial in improving some physiological traits and fluorescence indices, in general, natural greenhouse light was sufficient for growing Cyclamen in the seedling production stage.
