Showing 6 results for nezami
Dr. Ghasemali Garoosi, Mr. Esmaeil Nezami, Mr. Omid Ostadsharif,
Volume 6, Issue 19 (vol.6,no. 19, Year 2017 2018)
Abstract
Saint julien A is one of the important semi-dwarf rootstocks belonging to prunus family in terms of resistance to some common disease and pests in stone-fruits in addition to its high compatibility to different stone-fruit cultivars. In this study, the effects of methyl jasmonate, TIBA and scopoletin were studied on some parameters of shoot regeneration, IAA-Oxidase activity as well as improving some growth deficits such as eradication of sluggish grown of regenerated shootlets, under in vitro condition. Two types of explants were subjected to experiments: normal and sluggish grown explants. Results revealed that in the normal grown explants scopoletin and methyl jasmonate (1.0 mg/l) affected significantly the shoot number regeneration (4.12±0.17 and 3.18±0.18) and the shoot length (4.13±0.11 and 3.19±0.06 cm) respectively on MS medium. These chemicals have had also significant effects on mean shoot number (3.5±0.2 and 2.06±0.06) and shoot length (1.77±0.02 and 1.45±0.03cm) respectively in the sluggish grown explants compared to control and TIBA. Results also indicated a considerable increase in IAA-Oxidase activity for sluggish grown shoots in comparison with control. Besides, the incorporation of TIBA to media decreased significantly the activity in IAA-Oxidase in both normal and slow grown explants along with 30 days.
Mohammad Kafi, Mohsen Tarigholeslami, Ahmad Nezami, Reza Zarghami,
Volume 6, Issue 19 (vol.6,no. 19, Year 2017 2018)
Abstract
Chilling stress usually can be seen in tropical and subtropical crops or in crops which are grown in afore mentioned areas. Generally, the crops are very sensitive to chilling stress during their active growth and early stages of their development. In this research, a study on the effects of chilling stress and salicylic acid on physiological and biochemical traits of corn hybrid single-cross 400 in factorial arrangement in a completely randomized design in the research greenhouse of Ferdowsi University of Mashhad has been investigated. To this, chilling stress in two levels (i.e. non-stress control, and chilling stress at 5⁰C in four-leaf satge using thermogradient freezer for 12 hours) as the main factor and three levels of spraying salicylic acid solution (non-spraying control, 200 and 400 micro molar spraying) as subsidiary factor was applied. The results showed that the concentrations of malondialdehyde, Di-tyrosine and proline increased and the activity of superoxide dismutase, glutathione peroxidase and catalase enzymes decreased significantly in chilling stress. Spraying of 200 and 400 micro molar salicylic acid solution ameriolated the negative effect of chilling stress. Electrolyte leakage increased, while, water content and dry matter accumulation and leaf area has been decreased in the presence of chilling stress. Spraying of salicylic acid solution caused an increase in chlorophyll content. Indeed, a significant correlation between the cold damage, salicylic acid treatment, and investigated traits were appeared that represent the corn seedling’s positive reaction to salicylic acid in chilling stress condition. 400 mM salicylic acid proline sprayed most of the 39.5 micromoles per gram of fresh weight, respectively.
Atiyeh Oraee, Ali Tehranifar, Ahmad Nezami, Mahmoud Shoor,
Volume 8, Issue 32 (vol. 8, no. 32. 2020 2019)
Abstract
Today, the ornamental plants survival in the green space due to climate change and a sudden increase in temperature in cold seasons has been compromised. In order to evaluate the effect of irrigations and temperatures on viola plants, a factorial experiment was conducted based on completely randomized design with four replications in faculty of agriculture, Ferdowsi University of Mashhad. Experimental factors include levels of irrigation water (80%, 60 % and 40 % FC) and levels of temperatures (20, 0, -3, -6, -9, -12, -15, -18, -21 and -24 °C). After irrigation treatments, some traits including proline, carbohydrate, chlorophyll (a, b and total), carotenoid and relative water content and after temperature treatments activity of superoxide dismutase, ascorbate peroxidase and total phenol were determined. The results showed that carbohydrate and proline significantly increased and chlorophyll and relative water content decreased at 40% irrigation treatment. Interaction effects of irrigation and temperature treatments significantly affected the activity of two enzymes. The maximum activity of superoxide dismutase and ascorbate peroxidase in 40% FC level of irrigation water at 0 °C were seen, but with decreasing temperature, the activity of these enzymes were reduced. In three irrigation levels, the amounts of total phenols were increased from 20 to 0 °C and reached to minimum at -24 °C. After the recovery period, plants treated with 60% FC at 0 °C showed the highest vegetative traits (height, number of nodes, leaves, offshoot and flower diameter).
Dr. Jafar Nabati, Prof. Ahmad Nezami, Prof. Mohammad Kafi, Dr. Elaheh Boroumand Rezazadeh,
Volume 8, Issue 34 (vol. 8, no. 34 2020)
Abstract
Lack of chickpea cultivars tolerant to extreme freezing is a limiting factor for autumn planting of this crop in cold areas. In this study, 58 Kabuli-type chickpea genotypes and a control (an international sensitive genotype) were planted in pots and first exposed to -10°C and then to -15°C after being acclimated in natural conditions. No destructive effect of -10°C was observed in plants. So, acclimation was repeated and plants were transferred to -15°C. Survival percentage was measured after three-weeks recovery period. In continue, 19 genotypes with higher survival percentage along with the control were exposed to temperatures of -16, -18 and -20°C after they were acclimated in controlled conditions. Experiments were arranged as Completely Randomized Design with three replications. Results indicated that seven genotypes had survival percentage more than 80%, 24 genotypes more than 25% and 25 genotypes could not survive in -15°C. MCC803 had the highest and MCC808 and MCC510 the lowest survival percentage. All the genotypes were killed in -18 and -20°C. Among 19 studied genotypes, eight were able to tolerate -16°C. Among factors affecting cold tolerance such as soluble carbohydrates, proline, total phenol, photosynthetic pigments, DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity and malondialdehyde, soluble carbohydrates showed significant positive correlation with chickpea survival percentage. Generally, among the studied genotypes four genotypes (MCC53, MCC770, MCC776, MCC809 and MCC815) are recommended as promising genotypes for freezing tolerance.
Jafar Nabati, Rezvan Ramezannejad, Ahmad Nezami,
Volume 12, Issue 54 (vol. 12, no. 54 2023)
Abstract
Salinity is one of the most important non-biological stresses that has an adverse effect on the growth and production of crops. Chickpea (Cicer arietinum L.) is sensitive to salt stress. This study was performed to select the salt tolerance genotypes of chickpea. For this purpose, 72 genotypes were screened for dSm-112 salinity tolerance. This study was performed in a completely randomized design with three replications as hydroponic culture. Among the studied genotypes, 53 genotypes had a survival of more than 75%, and no genotype had a survival of less than 25%. The highest mean content of soluble carbohydrates, total phenol, proline, osmotic potential, inhibition of free radical activity of DPPH and relative water content were observed in genotypes with a survival range of 100-76%. The mean malondialdehyde content was highest in genotypes with a survival range of 50-26%. The results of cluster analysis showed the relative superiority of the second group genotypes including MCC1037, MCC1212, MCC1286, MCC1138, MCC1278, MCC1129, MCC1140, MCC1234, MCC1299, MCC1289, MCC1041, MCC1132, MCC1276, MCC1211, MCC1211 and MCC1010 in most of the studied traits. Chickpea genotypes appear to use a variety of mechanisms to tolerate salinity, which helps to replace more salinity-tolerant genotypes in tolerant chickpea.
Vajihe Heydari, Mohammad Javad Ahmadi-Lahijani, Jafar Nabati, Ahmad Nezami,
Volume 12, Issue 56 (vol. 12, no. 56 2023)
Abstract
Salinity stress is one of the most important abiotic stresses that diminishes the yield of crops in semi-arid and arid regions. To investigate the effect of salinity stress on the physiological and biochemical characteristics of different lentil genotypes, a split plots experiment was conducted in a randomized complete block design with three replications in the salinity research farm of the Ferdowsi University of Mashhad in the 2021–2022 cropping year. The salinity levels of 2.5, 6, and 9 ds/m-1 six lentil genotypes were placed in the main plots and the secondary plots, respectively. The results showed that the carotenoids, phenols, leaf sodium contents, and biomass decreased with the increase in salinity stress level. The highest phenolic content of leaves was observed in salinity of 2.5 dS/m and MLC178 genotype, and with increasing stress intensity to 6 and 9 dS/m, the phenolic content of leaves decreased by 28 and 238%, respectively. MLC118 genotype had the highest activity of catalase enzyme under the condition of 2.5 dS/m and catalase enzyme activity decreased by 1.09 and 1.94 times with the increase of salinity stress to 6 and 9 dS/m, respectively. On the other hand, the highest biomass was observed at the level of 2.5 dS/m in the MLC117 genotype, which produced more biomass about two times compared to higher salinity levels. The MLC26 genotype had the highest proline content in leaves at a salinity stress level of 9 dS/m, when the salinity stress level decreased to 6 and 2.5 dS/m, the proline content of leaves decreased by 4% and 46%, respectively. In general, MLC117 and MLC12 genotypes were superior in most traits under salinity stress conditions.
