Ghasem Khodahami; Ehsan Zandi Isfahan; Mohammad Hasan Assareh
Volume 21, Issue 2 , August 2014, , Pages 274-282
Abstract
In the current study, the salinity tolerance of Atriplex leucoclada, a native species to Iran with appropriate nutritional value for livestock, was investigated under greenhouse condition and natural habitats of Fars province. For this purpose, NaCl treatments at different concentrations of 0, 100, ...
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In the current study, the salinity tolerance of Atriplex leucoclada, a native species to Iran with appropriate nutritional value for livestock, was investigated under greenhouse condition and natural habitats of Fars province. For this purpose, NaCl treatments at different concentrations of 0, 100, 200, 300, 400, and 500 mM were applied on pots in a growth chamber at 20°C and a photoperiod of 8/16 h (light: dark), and growth characteristics were measured. Soil and plant sampling was conducted in natural ecotypes of Atriplex leucoclada in Darab region. Plant samples were collected randomly from the roots and shoots in vegetative growth stage, and soil samples were taken from two soil depths of 0-10 and 10-45 cm. The results of NaCl effects on growth characteristics of Atriplex leucoclada in vegetative growth stage showed that significant differences were found among the studied concentrations of NaCl as compared to the control group. Our results clearly showed that all studied growth characteristics including shoot fresh and dry weight, root fresh and dry weight, LWR, LAR, SLA, plant height and LA increased at concentrations of 0, 100, 200, and 300 mM in comparison with control. However, increasing salinity stress more than 300 mM caused to the reduction of growth characteristics significantly. As a result, salinity stress up to 300 mm NaCl not only limited the growth of Atriplex leucoclada but also increased the growth characteristics, indicating that this species is an obligatory halophyte in vegetative growth stage.
Behruz Rasuoli; Bahram Amiri; Mohammad Jafari; Mohammad hasan Assareh
Volume 18, Issue 4 , September 2012, , Pages 505-514
Abstract
This study was carried out to determine the effect of different NaCl and Na2SO4 concentrations, including (0, 100, 200, 300, 400 and 500 mM), on germination and initial growth of Seidlitzia rosmarinus. Germination percentage, germination rate, germination index, seed vigor index, radicle length, and ...
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This study was carried out to determine the effect of different NaCl and Na2SO4 concentrations, including (0, 100, 200, 300, 400 and 500 mM), on germination and initial growth of Seidlitzia rosmarinus. Germination percentage, germination rate, germination index, seed vigor index, radicle length, and plumule length were measured. Our results showed that the most of studied characters were severely inhibited at high concentration of NaCl and Na2SO4. The results revealed that the effects of the same concentrations of NaCl and Na2SO4 on radicle, plumule and plant length were significantly different, but germination percentage, germination rate, germination index and seed vigor index did not show significant differences. In general, the results indicated that Seidlitzia rosmarinus was more sensitive to Na2SO4 than NaCl and it could be considered asa chlorophyte halophyte.
Bahram Amiri; Mohammad hasan Assareh; Mohammad Jafari; Behruz Rasuli; Ali ashraf Jafari
Volume 19, Issue 2 , September 2012, , Pages 233-243
Abstract
Salinity is one of the main expanding constraints in lands under cultivation. Therefore, the ability of plants to survive under such a condition is important for ecological distribution of the species and agricultural development. Despite extensive research in this area, there are still many issues associated ...
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Salinity is one of the main expanding constraints in lands under cultivation. Therefore, the ability of plants to survive under such a condition is important for ecological distribution of the species and agricultural development. Despite extensive research in this area, there are still many issues associated with salt tolerance of plants. In this research, germination and seedling growth of two native species of Salicornia herbacea and Alhagi persarum were evaluated under different salinity levels. Seeds of these species were treated by different concentrations of NaCl and Na2SO4 in a growth chamber for 45 days. According to the results, germination and seedling growth of both species showed significant differences at in different salinity levels. Up to 200 mM and 150 mM NaCl, no significant differences were recorded for Salicornia herbacea and Alhagi persarum, respectively. In contrast, increment of sodium sulphate up to 100-150 m M, increased seedling growth and germination of Salicornia herbacea. While, a drastic decrease of germination was recorded for Alhagi persarum at 50 mM sodium sulphate. In general, it could be stated that Salicornia herbacea was more resistant to salinity.
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.
fahimeh Arab; Ali- Ashraf Jafari; Mohammad- Hassan Assareh; Mohammad Jafari; Ali Tavili
Volume 18, Issue 1 , May 2011, , Pages 17-31
Abstract
Agropyron deserterum andAg. elongatum species have a high value for both fresh and dry forage and because of high production and top acceptance by livestock they have specific value in the beginning of the growth season for livestock grazing. This research was conducted to study the effects of ...
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Agropyron deserterum andAg. elongatum species have a high value for both fresh and dry forage and because of high production and top acceptance by livestock they have specific value in the beginning of the growth season for livestock grazing. This research was conducted to study the effects of salinity stress on the mentioned species in germination and vegetative growth stages. A completely randomized design including five levels of 0, 100, 200, 300 and 400 mM NaCl and CaCl2 with 4 replications was used. Seeds were sown in laboratory and germination percentage, germination velocity, vigor index, plumule and radicle length and seedling dry weight were calculated. In greenhouse condition, shoot and root length, seedling dry weight, dry weight to fresh weight ratio, leaf area and specific leaf area were measured. According to the results, in both studied species germination percentage, plumule and radicle length, seedling dry weight, leaf area and specific leaf area were reduced with increase of salinity. The results showed significant differences between two species for germination percentage and germination velocity (P≤0.01). In both germination and vegetative growth stages, Ag.elongatum was more salt tolerant than Ag.desertorum. The results indicated that Ag.elongatum was more salt tolerant species than Ag.desertorum and it can be recommended for cultivation in moderate saline rangelands.
Behruz Rasouli; Bahram Amiri; Mohammad Hasaan Assareh; Mohammad Jafari
Volume 18, Issue 1 , May 2011, , Pages 32-41
Abstract
This research was performed to determine the nutritional value of a halophyte species, Halostachys caspica in three different phonological stages including primary growth, flowering and seed ripening in three different sites i.e, Qom, Yazd and Urmia provinces Plant sampling was completely randomized ...
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This research was performed to determine the nutritional value of a halophyte species, Halostachys caspica in three different phonological stages including primary growth, flowering and seed ripening in three different sites i.e, Qom, Yazd and Urmia provinces Plant sampling was completely randomized and crude protein, ether extract, water percentage, acid detergent fiber, ash, dry matter digestibility and metabolism energy were measured by standard methods. Data analysis was done using SPSS software in a factorial design. According to the results, interaction effects of growth stages and different ecological sites showed a significant difference for most of the measured factors and they did not follow a regular trend. The results indicated that H. caspica had the highest forage quality in flowering (second stage) while with increase of plant age, crude fiber and ash increased in all the three studied sites. Growing in sever ecological conditions and having high forage quality, H. caspica may be considered for sustainable development plan in saline regions.
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.