Behrooz Salehi-Eskandari; Farzaneh Aslani
Abstract
Echinophora platyloba is an aromatic perennial plant belonging to the family Apiaceae which is used as food seasoning and persevering in Iran and the shoots have medicinal properties. This study aimed to investigate treatments of moist chilling (0,30, 45, 70 and 90 days), gibberellic acid (GA3; 0, 500, ...
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Echinophora platyloba is an aromatic perennial plant belonging to the family Apiaceae which is used as food seasoning and persevering in Iran and the shoots have medicinal properties. This study aimed to investigate treatments of moist chilling (0,30, 45, 70 and 90 days), gibberellic acid (GA3; 0, 500, 1000 and 2000 mg/L) and scarification alone or a combination of these treatments for breaking seed dormancy of E. platyloba. The dormancy of the seeds was broken only after 90 days of moist chilling. Pretreatment GA only at the highest level (2000 mg/L) could induce seed germination (GP; 33%), the highest GP (50%) and germination index (GR; 3 seeds per day) was recorded in moist chilling treatment 45 days with GA3 treatment of 1000 mg/L. The lowest of GR was related to moist chilling treatment for 90 days and moist chilling treatment for 30 and 70 days with GA3 treatments of 500 and 2000 mg/L. The scarification treatment alone or combined with other treatments does not affect germination parameters.
Jalil Abaspour; Behrooz Salehi-Eskandari; Maryam Montazeri-Najafabadi
Abstract
Nickel is an essential microelement, but the increased concentration it in the medium disrupts the germination and growth of plants. In the present study, the effect of pretreatment and exogenous proline in the seedling growth of Cucumis melo under nickel stress was investigated. For this purpose, seeds ...
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Nickel is an essential microelement, but the increased concentration it in the medium disrupts the germination and growth of plants. In the present study, the effect of pretreatment and exogenous proline in the seedling growth of Cucumis melo under nickel stress was investigated. For this purpose, seeds were divided into two groups. In one group, seeds were sterilized for 24h, then they soaked in 0, 10 mM proline and finally cultured in different nickel concentrations. Another group seeds were soaked in deionized water for 24 hours and then cultured in petri dishes containing the same from one another concentrations of nickel and proline. All seeds were kept for 10 days, then measured germination, and growth parameters and membrane stability. The results showed that germination parameters were not affected by nickel. Radicle was more sensitive to Ni excess than hypocotyl. The amount of malondialdehyde increased with increasing nickel concentration. Add exogenous proline significantly reduces germination percentage and germination index but it increased mean germination time. Proline pretreatment in the presence of nickel treatments improved radical length, root to shoot ratio. But the addition of exogenous proline increased hypocotyl length while radical length and their ratio decreased in lower exposure levels. However, exogenous proline reduced lipid peroxidation and membrane permeability more than similar treatments under nickel treatments. Proline, as a pretreatment as a compatible solution and antioxidant, improves the early stages of growth and reduces the damage caused by nickel toxicity in the early stages of cucumber seedling growth.
Behrooz Salehi-Eskandari; Mohsen Kaviani
Abstract
Astragalus, is one of perennial and various species which is expanded in an Iranian’s ranges. In regard to the expansion of plant shoot in grassland with steep, we can use it to prevent soil erosion. Also, we use some species of Astragalus to gum tragacanth extract. This study aimed to identify ...
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Astragalus, is one of perennial and various species which is expanded in an Iranian’s ranges. In regard to the expansion of plant shoot in grassland with steep, we can use it to prevent soil erosion. Also, we use some species of Astragalus to gum tragacanth extract. This study aimed to identify methods of dormancy breaking and characters of germination in four species that was designed. Seeds of four species A. brevidens, A. podolobus, A. caragana, and A. cyclophyllus were purchased from the Seeds Institute of the name of Isfahan Pakan Bazr. Treatments used for the experiment were dry chilling for 15 and 30 days, moist chilling for 15 and 30 days, scarification with sandpaper, and gibberellic acid (GA3, four levels). The results demonstrated that treatments of scarification and moist chilling for 15 days are the most effective treatments to increase seed germination. The majority of species moist chilling for 15 days can significantly increase the germination index while minimum germination index belongs to scarification, which consequently increased the mean germination time. Between the species, the A .caragana has the most germination percentage and germination index, which shows the highest compatibility of this species to the ecological condition in an Iranian Ranges.