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Articles by R. Heydari
Total Records ( 7 ) for R. Heydari
  F. Khosravinejad , R. Heydari and T. Farboodnia
  In this study, we investigated antioxidant responses of activities of Superoxide Dismutase (SOD), Catalase (CAT), Ascorbate Peroxidase (APX) and Guaiacol Peroxidase (GPX) to saline stress in two barley varieties named Hordeum vulgare L. var. Afzal and var. EMB82-12 treated with 50, 100, 200, 300 and 400 mM NaCl for 3 days. The MDA content of Afzal plants grown under different salt regimes remained nearly constant but it largely increased in EMB82-12 plants under the same conditions. There was a linear and significant correlation in CAT, APX, SOD, GPX activities in Afzal plants in response to increased salt concentration. The strong and positive correlation between antioxidant enzymes and salt concentrations, may account for the MDA level of Afzal plants remaining constant in response to different salt regimes. In general, the activities of antioxidant enzymes were increased in the root and shoot under saline stress. But the increase was more significant and consistent in the root. Among the antioxidant enzymes, CAT activity was increased the most drastically.
  F. Khosravinejad , R. Heydari and T. Farboodnia
  Salinity (NaCl Stress) was applied with 50, 100, 200, 300 and 400 mM NaCl. The shoot and root respiration of two barley cultivars (Hordeum vulgare L. variety Afzal and variety EMB82-12) were determined in various concentrations of NaCl. Chlorophyll a,b and total chlorophyll content were significantly decreased, but carotenoids content increased under salinity. Decrease of chlorophyll content in EMB82-12 was higher than Afzal, but carotenoids content in Afzal variety was higher than EMB82-12. Relative Water Content (RWC) was used to indicate the degree of stress. Oxygen uptake declined in shoot and root with increasing NaCl concentrations. Decrease of oxygen uptake in shoot and root of EMB82-12 variety was higher than Afzal variety. RWC decreased with increasing NaCl concentrations. Lowering of RWC reduced growth and increased shoot/root ratio. Decrease of water content in EMB82-12 plants was higher than Afzal plants. Shoot/root ratio in EMB82-12 variety was higher than Afzal.
  F. Khosravinejad , R. Heydari and T. Farboodnia
  Salinity (NaCl stress) was applied with 50, 100, 200, 300 and 400 mM NaCl. The shoot and root length, fresh and dry weight, sodium and potassium content of two barley varieties (Hordeum vulgare L. var. Afzal and var. EMB82-12) were determined in various concentrations of NaCl. Root and shoot length, fresh and dry weight were decreased in two barley varieties in response to increased salt concentration, but the decrease was more significant in the root. Sodium content was increased and potassium content was decreased in two barley varieties in response to different salt regimes, but in general, these changes were more significant in the root.
  F. Khosravinejad , R. Heydari and T. Farboodnia
  Salinity (NaCl Stress) was applied with 50, 100, 200, 300 and 400 mM NaCl. The shoot and root water content and organic solutes contents of two barley varieties (Hordeum vulgare L. var. Afzal and var. EMB82-12) were determined in various concentrations of NaCl. Soluble sugar and proline contents were increased in two barley varieties in response to increased salt concentration, but this increase in Afzal var. were higher than EMB82-12. Soluble protein content was decreased in two barley varieties in response to different salt regimes and this decrease in Afzal var. was lower than EMB82-12 var. RWC decreased with increasing NaCl concentrations. Decrease of water content in EMB82-12 plants was higher than Afzal plants.
  S. Fallahi , M. Habibi-Rezaei , M. Khayami and R. Heydari
  Present study investigate the toxicity effect of 2,4,6-trinitrotoluene (TNT) on a terrestrial plant, alfalfa (Medicago sativa) in artificial soils. In this study, TNT toxicity assessment was performed on spiked silica with this nitroaromatic compound by determination of the percent of emergence and shoots and roots biomasses at the concentration range of 3.2-10000 mg kg-1 Dry Weight (DW). The emergence was reduced by 22-32% after 5 days of exposure at TNT concentrations up to 100 mg kg-1 DW; shoot and root biomasses were reduced by 48-50 and 63-74%, respectively after 30 days exposure at TNT concentrations ≤32 mg kg-1 DW. Concentrations higher than 100 mg kg-1 DW can not be tolerated at all. Concentrations of TNT and its metabolites insilica, root and shoot were measured by High-Performance Liquid Chromatography (HPLC). Analyses of TNT spiked soil extracts reveal hat during alfalfa cultivation for 30 days, TNT was partially transformed at the extent of 15-27%. This transformation decreased at higher TNT soil concentrations. TNT is taken up and metabolized by plants to its downstream derivatives.
  Sh. Jalili , M. Ilkhanipour , R. Heydari , S. Salehi and A.A. Farshid
  Endosulfan, an organochlorine insecticide and acaricide, has been used in agriculture for several years. The aim of present study was to analyze the cardiotoxic effect of endosulfan which caused biochemical changes in heart of male rats and to evaluate the possible protective effect of vitamin E. Vitamin E (200mg/kg, twice a week), endosulfan (2mg/kg per day, once a day in corn oil) and Vitamin E (200mg/kg, twice a week) + endosulfan (2mg/kg per day, once a day in corn oil) combination were given to rats (n=6) orally via gavage for 4 weeks. GPx and CAT activities were measured in tissues samples. Gpx, CAT and SOD activities increased in the endosulfan - treated group heart tissues compared to control group (P<0.01, P<0.05 and P<0.01 respectively). GPx and SOD activities decreased in the endosulfan+vitamin E - treated group compared to endosulfan - treated group (P<0.05). Decrease of CAT activity was not significant in the endosulfan+vitamin E - treated group compared to endosulfan - treated group. We conclude that vitamin E significantly reduces endosulfan - induced oxidative stress in rat heart.
  R. Heydari , E. Pourjam and E. Mohammadi Goltapeh
  Antagonistic effect of five species of Pleurotus, including P. ostreatus, P. sajor-caju, P. cornucopiae, P. florida and P. eryngii on second stage juveniles (J2) of Meloidogyne javanica were studied, in vitro. On water agar, all of the species tested produced tiny droplets of toxin. Nematodes touching such droplets showed a sudden response and became colonized by the fungi after 24-48 h. Filtrates of the tested fungi grown in malt extract broth were toxic on the nematodes but this toxicity varied between species. Culture filtrates of P. ostreatus showed the highest nematicidal activity toward M. javanica J2 and the lowest toxic effect was observed in filtrates of P. eryngii. A linear relationship was proved between increasing toxin concentration and the percentage of dead nematodes.
 
 
 
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