Morteza Saberi; Vahid Karimian; Majid khazaei
Abstract
The allelopathic influence of aqueous extracts of Eucalyptus camaldulensis on Cassia angustifolia Vahl., Datura stramonium L. and Hibiscus sabdariffa L. germination (%), germination stages and seedling growth were examined. For this goal, the extract was prepared from the shoot and roots of Eucalyptus ...
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The allelopathic influence of aqueous extracts of Eucalyptus camaldulensis on Cassia angustifolia Vahl., Datura stramonium L. and Hibiscus sabdariffa L. germination (%), germination stages and seedling growth were examined. For this goal, the extract was prepared from the shoot and roots of Eucalyptus camaldulensis firstly. The extract was diluted by adding distilled water to 0 (control), 25, 50, 75 and 100 percent. The effect of the four mentioned treatments, as well as distilled water as control were studied in four repetitions on seed germination using a completely randomized design. Results showed that there were significant differences among the measured characteristics for germination percentage and speed, length of root, length of shoot, length seedling and vigority index (p<1%) in all three species. Comparison of means indicated that increasing the concentration of allelopathic extract of Eucalyptus decreased seed germination and initial growth of seedlings in all three species significantly. The highest germination percentage and speed was belonging to Hibiscus sabdariffa (60% and 3.5) at zero concentration (control). Also, germination of Datura stramonium done only until concentration of 25 percent (20%) and at concentrations 50, 75 and 100 % it was zero. According to the results Datura stramonium had more sensibility than two other species related to allelopathic effect of Eucalyptus camaldulensis. Generally, it is recommended not to plant eucalyptus as a windbreak with medicinal species Cassia angustifolia, Datura stramonium and Hibiscus sabdariffa as much as possible in the study area.
Morteza Saberi; Soheila noori; Fahimeh Rashidi
Abstract
Germination is one of the most important stages of plant growth that may be affected by different stresses in natural environments. This study was kind aimed to investigate the effects of substrate and different levels of gibberellic and indole butyric acid on germination characteristics of ...
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Germination is one of the most important stages of plant growth that may be affected by different stresses in natural environments. This study was kind aimed to investigate the effects of substrate and different levels of gibberellic and indole butyric acid on germination characteristics of Salvadora persica seeds in 2019. Two factors was considered consist of substrate (in four types (1- pit moss, 2 - cocopit and 3 - pit moss 50% + sand 50% 4 - Cocopit 50% + 50% sand), and gibberellic acid (in two levels 250 and 500 ppm) and indole butyric acid (in two levels 250 and 500 ppm). Then, the effect of these two factors and distilled water as the control in three replications on seed germination and seedling growth of Salvadora persica was investigated using a completely randomized factorial design. The results showed that the substrate had a significant effect on germination percentage, root length, shoot length, seedling, fresh root weight, shoot fresh weight and seed vigor index (p < 0.01). Seed pretreatment with gibberellic and indole butyric acid hormones had a significant effect on all studied characteristics. Interaction of substrate type and pretreatment with hormones had a significant effect on germination percentage, root length, shoot length, seedling and seed vigor index (p < 0.01) and had no significant effect on root and shoot fresh weight. The highest germination percentage was obtained in cocopeat and gibberellic acid 250 ppm (73%).
Morteza Saberi; Alireza shahriari; Marziyeh bozorgmehr
Abstract
An experiment was performed aimed to investigate the effects of priming and salinity on germination and seedling growth of Stipagrostis plumose in factorial test and completely randomized design with four replications in laboratory condition. The first factor was priming consist of salicylic acid with ...
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An experiment was performed aimed to investigate the effects of priming and salinity on germination and seedling growth of Stipagrostis plumose in factorial test and completely randomized design with four replications in laboratory condition. The first factor was priming consist of salicylic acid with three levels (100, 200 and 300 mg/l), gibberellic acid with three levels (125, 250 and 500 ppm), ascorbic acid with three levels (100, 200 and 300 mg/l), and water as control, and the second factor was salinity treatment in six levels (0, 0.2, 0.4, 0.8, 1.2, 1.6 m/l). The measurement characteristics were speed of germination, percent of germination, root length, shoot length, seedling length and seed vigor. Results indicated that salt stress had inhibitive effect on germination and early seedling growth of S. plumosa. All chemical stimulators increased the germination characteristics of this plant. Also, the interaction of the tested treatments showed that gibberellic acid 250 ppm has the highest effect on improvement of germination characteristics under all levels of salinity stress. We conclude that priming seeds by gibberllic acid can increase resistance the germination of S. plumosa in areas prone to salinity.
Morteza Saberi; vahid karimian; Hamid Niknahad Gharemakhar
Abstract
Many regular visits were done to investigate the phenological stages of the plant in Zabol and Saravan habitats. Plant cover of the species was investigated by plot with 4 square meter along to 4 transect with 200 meters. To investigate their physicochemical properties of soil, soil sample were taken ...
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Many regular visits were done to investigate the phenological stages of the plant in Zabol and Saravan habitats. Plant cover of the species was investigated by plot with 4 square meter along to 4 transect with 200 meters. To investigate their physicochemical properties of soil, soil sample were taken from 0-30 cm depth under the species and area without species. Forage quality index was analyzed by 4 replication on three phenological stages (vegetative, flowering and maturity stages). Results indicated that the first leaves of the species were initiated in March and August is the end of growing period. The average of canopy cover and density of Citrullus colocynthis had significant difference in the two regions (P<0.01). The rooting depth of this species was 207 and 123 centimeters in Zabol and Saravan habitats, respectively. The results showed that the electrical conductivity, carbon and organic matter under the studied species were significantly higher than the control area. The results of soil analysis under the species of two habitats also showed that sand, silt, acidity, lime and organic carbon content were significant at 5% level (p <0.05) and organic matter was significant at 1% level (p <0.01). Also, the average of sand, acidity, organic creatinine and organic matter of Zabol habitat was higher than Saravan, but the amount of silt and lime in the plant cover was higher in Saravan than that of Zabol.
Morteza Saberi; vahid karimian
Abstract
The studies of functional features of patches of rangelands will help effectively in the detection the healthiness of arid and semi-arid rangelands, the improvement of soil conditions as well as the recognition of the effects of managerial and natural changes of rangelands. In order to investigate the ...
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The studies of functional features of patches of rangelands will help effectively in the detection the healthiness of arid and semi-arid rangelands, the improvement of soil conditions as well as the recognition of the effects of managerial and natural changes of rangelands. In order to investigate the function of landscape, sampling from Niatak region of Sistan was conducted in the same condition that had some native plant species such as Alhagi camelorum and Salsola rigida and two planted species namely Tamarix ramosissima and Haloxylon persicum. Effect of these plant pots was investigated on characteristics of ecosystem function. 4 transect with 150 meters long was established and 11 soil surface indices was determined by using of three characteristics of stability, infiltration and cycling of nutrient from LFA method. The results indicated that two planted plant species had higher function rather than native plant species and differences were significant. Tamarix ramosissima had the highest function among the native and established plant species. In general, high function in planted patches ecological could be suggested to select suitable species in restorations of similar rangeland.
