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Articles by Seyed Ali Mohammad Modarres Sanavy
Total Records ( 6 ) for Seyed Ali Mohammad Modarres Sanavy
  Aria Dolatabadian , Seyed Ali Mohammad Modarres Sanavy and Mozafar Sharifi
  The effects of pretreatment with salicylic acid on wheat seed germination (Triticum aestivum L. cv. Roshan), lipid peroxidation, and superoxide dismutase, catalase, polyphenol oxidase, and peroxidase activity were studied under conditions of salt stress. Seeds treated with different concentrations of salicylic acid were used for measuring germination traits. Salt stress was induced by sodium chloride solution. Seeds were soaked in salicylic acid solution for 24 h, dried with sterile paper, transferred to sterile Petri dishes, and treated with 10 ml NaCl solution at different concentrations. After 1 week, the number of germinated seeds, root length, seedling length, and dry weight were recorded. Antioxidant enzyme activity and lipid peroxidation were also assayed. Salinity decreased seed germination. Thus, a high concentration of NaCl (200 mM) decreased germination by 17.6% compared with control treatment. Salicylic acid significantly increased germination in stressed and control seeds. Salicylic acid increased the level of cell division of seedlings and roots, which increased plant growth. Salt stress significantly increased the activity of the antioxidative enzymes catalase, superoxide dismutase, peroxidase, and polyphenol oxidase in wheat seedlings, and salicylic acid reduced the activity of antioxidant enzymes as stress signal molecules. Our results indicated that scavenging of reactive oxygen species was effective, especially by salicylic acid, and that membrane damage was limited. The aim of the present work was to study the character of changes in enzymatic systems induced by NaCl and salicylic acid in wheat seedlings under conditions of salt stress. In brief, salicylic acid treatment reduced the damaging action of salinity on embryo growth and accelerated a restoration of growth processes; thereupon it may be effective for the improvement of seed germination in arid and semi-arid regions.
  Batol Mahdavi , Seyed Ali Mohammad Modarres Sanavy , Seyed Farhad Saberali and Aria Dolatabadian
  In order to study the effects of different root-zone temperature (RZT) and two Rhizobium leguminosarum strains (originating from cold area and temperate area) on some grasspea (Lathyrus sativus) landraces (Ardabil, Shahrekord, and Zanjan) of Iran, an experiment was conducted in a controlled-environment chamber. In this experiment, four root-zone temperatures (5, 10, 15, and 25°C) and a constant air temperature were considered. Results showed that there were differences among the grasspea landraces for nodulation and nitrogen fixation, growth and development, and dry matter. Low RZT reduced growth, nodulation, and nitrogen fixation in grasspea landraces. Strains had different effects on landraces. Inoculated plants with strain originating from cold areas produced the most nodule number, and plant nitrogen concentration at 15°C RZT, whereas inoculated plants with strain originating from temperate area produced the most nodule number, and plant nitrogen concentration at 25°C RZT. Nodulation, nitrogen fixation, and nitrogenase activities of inoculated plants with a strain originating from cold areas in inoculated plants were higher at low temperature than in inoculated plants with a strain originating from temperate areas. This experiment also showed that grasspea production is not likely to be successful when RZT is below 10°C, especially during vegetative development. Therefore, in the zones where soil temperature is greater than 10°C RZT, grasspea landraces have normal growth and produce average yields.
  Zinolabedin Tahmasebi Sarvestani , Hemmatollah Pirdashti , Seyed Ali Mohammad Modarres Sanavy and Hamidreza Balouchi
  A field experiment was conducted during 2001-2003 to evaluate the effect of water stress on the yield and yield components of four rice cultivars commonly grown in Mazandaran province, Iran. In northern Iran irrigated lowland rice usually experiences water deficit during the growing season include of land preparation time, planting, tillering stage, flowering and grain filing period. Recently drought affected 20 of 28 provinces in Iran; with the southeastern, central and eastern parts of the country being most severely affected. The local and improved cultivars used were Tarom, Khazar, Fajr and Nemat. The different water stress conditions were water stress during vegetative, flowering and grain filling stages and well watered was the control. Water stress at vegetative stage significantly reduced plant height of all cultivars. Water stress at flowering stage had a greater grain yield reduction than water stress at other times. The reduction of grain yield largely resulted from the reduction in fertile panicle and filled grain percentage. Water deficit during vegetative, flowering and grain filling stages reduced mean grain yield by 21, 50 and 21% on average in comparison to control respectively. The yield advantage of two semidwarf varieties, Fajr and Nemat, were not maintained under drought stress. Total biomass, harvest index, plant height, filled grain, unfilled grain and 1000 grain weight were reduced under water stress in all cultivars. Water stress at vegetative stage effectively reduced total biomass due to decrease of photosynthesis rate and dry matter accumulation.
  B. Mahdavi Mahdavi , Seyed Ali Mohammad Modarres Sanavy and Majid Aghaalikhani
  In order to study the effect of four Root-Zone Temperatures (RZT) (5, 10, 15 and 25°C) on nodulation and nitrogen percent of four grasspea ecotypes (ardabil, zanjan, mashhad and sharkord), an experiment was conducted in a controlled-environmental chamber in 2005. There were differences (p<0.01) among ecotypes, RZT and ecotypes*RZT for root length, forage dry matter, root dry matter, nodule dry weight, nodule number, nodule cluster number, nodule cluster diameter, nodule diameter, nodule distribution (root length that has nodule) and plant nitrogen percent. Mashad and ardabil ecotypes produced the most and least nodule number at 25 and 5°C, respectively. The maximum and minimum nodule cluster number were observed in ardabil ecotype under 25 and 5°C RZT, respectively. Root distribution was the most and the least in mashhad and ardabil ecotypes under 25 and 5°C RZT, respectively. Ardabil produced the highest dry nodule weight at 25°C RZT. The least dry nodule weight was belonged to ardabil ecotype under 5°C RZT. Plant nitrogen percent was the highest in ardabile ecotype at 15°C RZT and the lowest in mashhad ecotype under 5°C RZT. This experiment showed that at low RZT (i.e., 5 and 10°C) none of ecotypes had preferred on other ecotypes in point of view measured traits except nodule diameter. Ardabile and mashhad ecotypes were better than other ecotypes at 15 and 25°C RZT respectively for most traits.
  Mashallah Daneshvar , Zeinalaabdine Tahmasebi Sarvestani and Seyed Ali Mohammad Modarres Sanavy
  In order to investigate the effect of irrigation and nitrogen fertilizer on agronomical and physiological traits of two winter rapeseed varieties, an experiment was established in a randomized complete block design as split-plot factorial arrangement with four replications in 2005-2006 at Agricultural Research Station of Khorramabad, Iran. Irrigation as main-plot factor consisted of four levels (I60, I90, I120 and I150). Sub-plot factors included nitrogen in four levels (N0, N70, N140 and N210 kg N ha-1) and two varieties (Zarfam and SLM046). Thousand-seed weight (TSW) in all irrigation and nitrogen levels was lower in the 2006 than that of the 2005. Seed oil percentage (SOP) was decreased with increasing water use only in second year. As nitrogen rate increased, SOP decreased and seed oil yield (SOY) increased in the 2006 significantly (p<0.05). With increasing water supply, SOY increased in first year. Zarfam variety had a higher TSW and SOP in both years. According to combined analysis results, seed and oil yield were not significantly affected by irrigation treatments and rapeseed varieties. Seed yield had not significant difference between 70 to 210 kg N ha-1 treatments. Both Water Use Efficiency (WUE) and dry matter remobilization efficiency (DMRE) were increased by decreasing water supply in I90 to I150 treatments. But N0 and N210 resulted in the lowest WUE and DMRE, respectively. Considering all traits, the first year of experiment was better than second year. The irrigation x variety interaction had a significant (p<0.01) effect on seed yield and WUE. Generally, I150N70V1 combination is recommended in the region of the study due to high performance in production of seed and oil yield.
  Gholamali Akbari , Seyed Ali Mohammad Modarres Sanavy and Saeed Yousefzadeh
  Seeds of three wheat (Triticum aestivum L.) cultivars included Mahdavi, Pishtaz and Shiraz, were used to investigate the effects of different salinity and auxin concentrations on their germination percent, radicle and hypocotyl length, seedling fresh and dry weight, radicle and hypocotyl dry weight. Results showed that increasing concentrations of NaCl reduced germination percentage, radicle length, hypocotyl length, seedling fresh and dry weight and hypocotyl dry weight. Hypocotyl dry weight increased in seeds only at -0.6 MPa. Auxin increased hypocotyl length, seedling fresh and dry weight and hypocotyl dry weight, but did not influence on seed germination percentage and radicle length. Pishtaz cultivar showed high seed germination percentage, radicle length and hypocotyl length in comparison to other cultivars while Shiraz cultivar had high radicle dry weights and Mahdavi cultivar produced high seedling fresh and dry weights.
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