Ali Vosough; Ali Ashraf Jafari; Ezat Karami; Reza Talebi; Houshmand Safari
Volume 29, Issue 3 , October 2022, , Pages 231-240
Farhad Veysei; Davod Akhzari
Volume 28, Issue 3 , October 2021, , Pages 424-434
Abstract
The aim of this study was to investigate the effect of Sufivand-manganese mine (located in Harsin city of Kermanshah province), on some soil characteristics, plant growth and some physiological traits of yellow milk-vetch (Astragalus parrowianus). Soil and plant samples of natural rangeland were taken ...
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The aim of this study was to investigate the effect of Sufivand-manganese mine (located in Harsin city of Kermanshah province), on some soil characteristics, plant growth and some physiological traits of yellow milk-vetch (Astragalus parrowianus). Soil and plant samples of natural rangeland were taken in May around Sufivand mine at different distances namely in the 100,500.1000,1500 and 2000 meters far from the mine respectively The statistical design of this project was performed based on a systematic random methodology in the five concentric circles around the Manganese mine. Six samples of soil and Astaragalus plant outside of manganese mine boundary (was not affected by mine) with the same edaphic and topographic conditions were sampled as a control treatment. The results of this project indicated that measured some physiological properties and plant growth were significantly affected by the distance from the Manganese mine. Hence, the maximum rate of root weight to canopy weight (0.85), transfer factor (1.9), root density factor (4) and proline content (0.8 μmol / g) were significantly observed at (p 0.05) compared to the control treatment at a distance of 100 meters from the mine. The minimum stem length (12 cm), total nitrogen content (3%), essential oil content (0.2%), catalase activity (0.45 Units/mg) and peroxidase activity (0.2 Units/mg) at 100 meters distance from the mine were significantly different from the control at (p 0.05). It is concluded that the closer distance to the mine the more hazard of manganese to the Rangeland plants.
Asghar Mosleh Arany; Gholamreza Bakhshi Khaniki; Bibi ozra Hakimi Bafghi
Volume 19, Issue 4 , March 2013, , Pages 581-589
Abstract
Potassium, sodium and free proline play important roles in adaptation of plant species to arid conditions. Distribution of Na+, K+ and free proline in desert plants is not clear. In this study, the accumulation of Na+, K+ and free proline was investigated in three species namely, Stipagrostis pennata, ...
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Potassium, sodium and free proline play important roles in adaptation of plant species to arid conditions. Distribution of Na+, K+ and free proline in desert plants is not clear. In this study, the accumulation of Na+, K+ and free proline was investigated in three species namely, Stipagrostis pennata, Calligonum polygonoides and Hammada salicornia. These species are naturally distributed in Irano-Turanian region. Six plants were selected from each species in the same conditions, in the dry summer of 2010. Soil humidity measurement showed that all plants were in drought conditions. Half of these plants were irrigated. The quantities of Na+, K+ and proline were determined in the roots and stems of all samples. Results showed that the concentrations of free proline in the stem and root of S. pennata were significantly higher than that of other two species and irrigated S. pennata. Furthermore, the concentration of K+ in the stem of H. salicornia was significantly higher than that of other two species and irrigated H. salicornia. Also, the concentration of K+ in the root of H. salicornia was higher than that of other species, but this concentration was not significantly different from the irrigated species. Sodium, like potassium content was higher in H. salicornia, but significant difference was not observed in its quantity between irrigated and unirrigated species. C. polygonoides after H. salicornia accumulated large quantities of Na+ in its stem. Sodium content was higher in the root of H. salicornia and C. polygonoides in comparison with S. pennata. Results also showed that K/Na ratio was less in roots of unirrigated species in all three species, particularly in S. pennata while it was high in stems of S. pennata H. salicornia compared to irrigated species. Consequently, it was concluded that these three species chose different strategies to cope with drought.
Mojtaba Akhavan Armaki; Hossein Azarnivand; Mohammad Hasan Asareh; Ali Ashraf Jafari; Ali Tavili
Volume 19, Issue 4 , March 2013, , Pages 669-678
Abstract
Drought has a major influence on morphological and physiological characteristics of plant species. Drought stress has a direct relationship with germination characteristics including germination percentage, seedling length (mm/plant), root to shoot ratio, seedling weight (g), ratio of dry weight to fresh ...
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Drought has a major influence on morphological and physiological characteristics of plant species. Drought stress has a direct relationship with germination characteristics including germination percentage, seedling length (mm/plant), root to shoot ratio, seedling weight (g), ratio of dry weight to fresh weight of seedlings (g.dfw-1) and seed vigor index (V). In this research, effects of drought stress on these characteristics were examined in four genotypes of Bromus inermis (Alborz 303, Mazandaran 3151, Firozkuh 3966 and Esfahan 200060) under laboratory and greenhouse condition. In greenhouse experiment, three physiological traits including chlorophyll, carbohydrates and proline contents were measured. Drought treatments included four levels of osmotic potential (0, -0.3, -0.6 and -0.9 MPa) in germinator and four levels of osmotic potential (FC, 25% FC, 50% FC and 75% FC) in greenhouse, made by Poly-Ethylene-Glycol (PEG 6000) solution in laboratory and weighting method in greenhouses, respectively. Results showed that Esfahan (200060) genotype was better than two other genotypes in terms of germination percentage under two conditions. Increasing drought stress increased proline and carbohydrate and decreased the chlorophyll content.
Ghader Karimi; Mohammad hasan Assareh
Volume 18, Issue 4 , September 2012, , Pages 537-546
Abstract
In the current study, some physiological responses of Kochia Prostrata to salinity stress were investigated. This species is native to Iran and could be used as forage for livestock. Plants were exposed to 0 (control), 50, 100, 150, and 200 mM NaCl. The experimental design was completely randomized design ...
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In the current study, some physiological responses of Kochia Prostrata to salinity stress were investigated. This species is native to Iran and could be used as forage for livestock. Plants were exposed to 0 (control), 50, 100, 150, and 200 mM NaCl. The experimental design was completely randomized design with 4 replications and 5 treatments. To prevent osmotic shock, the treatments were done gradually. After 21 days of the last salinity treatment, the plants were harvested and proline, glycinebetaine, soluble sugars, water potential and relative water content were measured. The result showed that in Kochia Prostrata, with an increase of salinity concentration up to 200 mM NaCl, proline, glycinebetaine and soluble sugars increased. According to the results, this plant tolerates the salinity through the synthesis of proline, soluble sugars and glycinebetaine as the mechanisms of salt tolerance. The high relative water content of the leaf (RWC) up to 150 mM and significant decrease of water potential also caused an increase of water use efficiency with low evaporation and transpiration from the leaves.
Ghader Karimi; Mohammad hassan Assareh
Volume 13, Issue 4 , February 2007, , Pages 402-409
Abstract
In this research salt tolerance and physiological characteristics of Atriplex verrucifera ecotypes in Tabriz, Qazvin and Arak rangelands were investigated. This species due to bushy form, salt resistant, proper proteine percent, is one of the native plants and valuable in saline ...
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In this research salt tolerance and physiological characteristics of Atriplex verrucifera ecotypes in Tabriz, Qazvin and Arak rangelands were investigated. This species due to bushy form, salt resistant, proper proteine percent, is one of the native plants and valuable in saline rangelands. These characteristics caused extensive use of this plant in rangelands reformation programs. The aim of this research paying attention to physiological parameters changes of salt resistant species ecotypes. Samples (soil and plant) of Atriplex verrucifera ecotypes were collected from Tabriz, Arak and Qazvin region and were analyzed. The experimental design was completely randomized design with 4 replications and 3 treatments (Tabriz, Arak and Qzvin). The studied parameters consisted of: water content relation, water potential, glycinebetaine, , proline, soluble sugars, starch, sodium, chlor, potassium, manganese, calcium, pH, Ec and soil texture. Results showed that rate of changes related water content, water potential, glycinebetaine, proline, soluble sugars, starch and ion accumulation in ecotypes were significant. Also in this research it was noted that salt resistant parameters in ecotypes dependent to climatic condition, soil chemical and physical characteristics. Results showed that Tabriz ecotype salt resistant parameters increased compared to others ecotypes.