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Articles by M. Shiri
Total Records ( 6 ) for M. Shiri
  H.R. Rahimi , M. Arastoo and M. Shiri
  Helicobacter pylori (H. pylori) is the bacterium responsible for many gastric disorders such as gastritis, gastric ulcer and gastric cancer. Half of the world's population is infected with H. pylori. Interestingly, the use of medical plants such as Punica granatum (P. granatum), commonly known as pomegranate, are being increasingly used throughout the world because of their efficacy and low toxicity. Studies have reported the antibacterial, anti-inflammatory and anticancer activities of P. granatum by various mechanisms including anti-adhesive, regulation of proliferation, cell survival, motility, invasion, apoptosis and cell-cycle pathways, increase in JNK phosphorylation and caspase-3 enzyme activity, decrease Akt and mTOR activation as well as inhibitory effects on IL-1β and NF-kB. Therefore, it can be suggested that P. granatum may reduce gastric diseases by eradication of H. pylori and also, it may reduce gastric disease symptoms and inhibit the progression of these diseases by its valuable properties. Our hypothesis will be confirmed in the future by experimental investigations such as using P. granatums alone or in combination with other drugs to create an herbal medicine for the prevention of gastric disease development which is induced by H. pylori.
  M. Shiri and R.T. Aliyev
  The DNA and RNA analysis can be useful to the selection of genotypes containing drought tolerance and good properties in the breeding program. So, this research was carried out on 38 maize (Zea mays L.) varieties to investigate the effect of drought stress on genome structure and its changes in drought tolerant, semi-tolerant and susceptible maize verities. For classifying maize varieties to three groups (drought tolerant, drought semi-tolerant and susceptible groups), seed germination ability was used under artificial water stress condition and in laboratory condition. Artificial water stress was created with sucrose solution at 10 atm. Then, one variety was chosen from each group (drought tolerant, semi-tolerant and susceptible groups). In drought tolerant, semi-tolerant and susceptible maize verities, stabile DNA, labile DNA, residual DNA and RNA were extracted. The results showed that the rate of labile DNA and RNA was increased 22.9 and 48.1%, respectively in tolerant variety under drought stress condition. Whereas in susceptible variety, the rate of those was decreased 35.9 and 17.2% under drought stress condition, respectively.
  A. Tobeh , Sh. Jamaati-e-Somarin , M. Panahyan-e-Kivi and M. Shiri
  In order to investigation of possible controlling effects of cover crops on weeds in subsequent cultivation (Corn) under Different Tillage Methods, two factorial experiment based on randomized complete block design were carried out in Karaj, Iran, in 2006, in two separate parts of a farmland considering great variations in growth and diversity of weeds. The main factor was cover crops including control (without crop cover), hairy vetch, Persian clover and rye and the second factor was planting date of cover crops under surface or disk tillage and common or moldboard tillage. One experiment was done before corn cultivation according to initial plot plan under disk tillage and another one was carried out under moldboard tillage with cultivation of corn SCK108. Results showed that inhibition potential of these two crops is higher due to higher N content of their aerial and root system (residue) that lead to increase in mean mineral and organic N content under disk tillage. It is possible that released inhibitors with higher remained N in soil had toxicity effects on weed germination, so that weed plant number and density decreased with the increase in N content of vetch and clover residue. The plant number of these weeds significantly decreased through planting vetch, Persian clover or rye as cover crop under surface tillage compared to control. Their TDW in the presence of vetch and Persian clover was significantly lower than that in the rye and control treatments under same tillage method. Similarly, soil mineral N content in the depth of 20-40 cm aggregately in three planting date under disk tillage in vetch and clover treatments was significantly higher than that in rye treatment that corresponds to the status of weeds. The amount of mineral N content was highest in rye treatment among all treatments under moldboard tillage. Among two kinds of tillage, surface or disk tillage had better results compared to common or moldboard tillage. It seems that nowadays surface tillage by different implements was extensively used in the cultivation of different crops under different conditions.
  M. Shiri , R.T. Aliyev and R. Choukan
  This study was carried out, in order to investigate the genetic structure of the 36 maize hybrids established from eighteen female lines and two male testers according to linextester method under non water stress and water stress conditions. So, 36 generated hybrids were planted in two experiments with normal irrigation and water stress at grain filling stage in Iran in 2008, using a RBCD design with three replications. The results showed that the effect of gene action could be both non additive and additive in the expression of grain yield under both conditions. However, GCA/SCA variance ratio revealed that non additive genetic variance was more important for grain yield than additive variance. Grain yield recorded high genetic variance value under non water stress condition compared to those under water stress condition. Also, narrow and broad sense heritability estimates in non water stress condition were higher than water stress condition. The lines L8, L11 and L17 in non stress condition and the lines L15, L16 and L17 in stress condition showed better general combining abilities for grain yield. The crosses such as L1xT1, L4xT1 and L8xT1 in non stress condition and L9xT2 in stress condition showed better specific combining abilities for grain yield. For choosing high efficient drought tolerance indices (SSI, TOL, MP and STI), broad sense heritability, narrow sense heritability and correlation of these indices were estimated. The results showed that STI was a successful index to select high yield and tolerant genotypes in comparison to SSI and TOL indices. Based on yield in both conditions and STI, the crosses L1xT1, L4xT1, L8xT1 and L17xT1 had the best tolerance to water stress at grain filling stage.
  M. Shiri , R. Choukan and R.T. Aliyev
  Drought stress is one of the most important a-biotic stresses influencing performance of crop plants. Therefore, the identification or the development of tolerant genotypes is of high importance for incorporating in maize production. So, in order to find the best drought tolerant hybrids, thirty eight maize hybrids were planted in two separate experiments with normal irrigation and water deficit at grain filling period using a Randomized Complete Block Design (RCBD) with three replications. Drought tolerance indices such as Stress Susceptibility Index (SSI), Mean Productivity (MP), Tolerance (TOL), Geometric Mean Productivity (GMP), Harmonic Mean Productivity (HAR) and Stress Tolerance Index (STI) were used to evaluate susceptibility and tolerance of the hybrids. Hybrids No. 4, 8, 17 and 38 had higher grain yield over the mean of the two conditions. These hybrids located at part of high yield potential and low sensitivity to drought (i.e., in part with up component one and down component two) in biplot. According to YP (grain yield in normal irrigation condition) and YS (grain yield in water deficit condition), hybrid No. 8 (K74/2-2-1-3-1-1-1-1 x K3653/2) was the best hybrid and can be used in future breeding programs to develop commercial hybrid.
  V.R. Rahimli , M.A. Abbasov and M. Shiri
  Molecular studies have shown that several genes with various functions are induced by drought stresses and that various transcription factors are involved in the regulation of stress-inducible genes. So, this research was carried out on 12 barley (H. nutans Schubl.) varieties, in order to investigate the effect of drought stress and phytohormones on genome structure and its changes in drought tolerant and susceptible barely verities. In drought tolerant and susceptible barely verities, stabile DNA, labile DNA, residual DNA and RNA were extracted. The results showed that the rate of Stabile DNA, Labile DNA and RNA was increased in tolerant variety under drought stress condition. Whereas, in susceptible variety; the rate of those was decreased under drought stress condition. Gibberellic acid plus Kinetin complex induced remarkable increasing on DNA and RNA content in drought susceptible variety, whereas it had little effect on those in drought tolerant variety.
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