Marjan Ghotbi

Publications (10) View all

• Source

  Available from: Mitra Ghotbi

  Article: Contribution of Vitaton (β- carotene) to the Rearing Factors , Survival Rate and Visual Flesh Color of Rainbow trout fish in comparison with Astaxanthin

  Marjan Ghotbi, Mitra Ghotbi
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  ABSTRACT: Vitaton ( an organic supplement which contains fermentative β-carotene ) and synthetic astaxanthin (CAROPHYLL® Pink) were evaluated as pro-growth factors in Rainbow trout diet. An 8-week feeding trial was conducted to determine the Vitaton’s effects versus astaxanthin on rearing factors , survival rate and visual flesh color of Rainbow trout (Oncorhnchynchus mykiss) with initial weight of 196±5. Four practical diets were formulated to contain 50 and 80 ppm of β-carotene and astaxanthin also a control diet was prepared without any pigment. Each diet was fed to triplicate groups of fish rearing in fresh water. Fish were fed twice daily. The water temperature was 13 ± 2 ˚C and dissolved oxygen content was 7 ± 0.5 mg/lit during the investigation. Results revealed that there were no significant differences between carcass yield besides visual flesh color (SalmoFan score) of fish fed Vitaton-containing diets within treatments . In contrast , feeding on diets containing 50 and 80 ppm of astaxanthin , increased SalmoFan score (flesh astaxanthin concentration) from < 20 ( < 1 mgkg-1) to 23.33 (2.03 mgkg-1) and 27.67 ( 5.74 mgkg-1) , respectively. A significant difference was seen between flesh carotenoid concentrations of fish feeding on astaxanthin-containing treatments and control treatment.
  International Journal of Biological and Life Sciences. 01/2012;
• Article: Contribution of Vitaton (β- carotene) to the Rearing Factors , Survival Rate and Visual Flesh Color of Rainbow trout fish in comparison with Astaxanthin

  Marjan Ghotbi, Mitra Ghotbi, Mohammad Wahsha
  Jordan Journal of Biological Sciences. 01/2011;
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  Available from: Marjan Ghotbi

  Article: SUBSTITUTION OF ASTAXANTHIN WITH ORGANIC VITATON FOR PROVIDING HEALTHIER FOOD

  Marjan Ghotbi
  Naaee congress. 01/2010;
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  Available from: Mitra Ghotbi

  Conference Proceeding: Study of Biological Characteristics which Affects Pathogencity of Fusarium oxysporum’s Isolate

  Mitra Ghotbi, Majid Amini Dehaghi, Marjan Ghotbi
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  ABSTRACT: According to the trail most probably this isolate of Fusarium oxysporum is formae special (f.sp.) of Orobanche aegyptiaca pers. The highest conidia production and germination were enumerated, consequently Semi-defined media culture (SD) was adjusted to pH 6.8 and C: N ratio of 15:1. Darkness relative to day light and Ultra Violet increased spore production and germination as well as germ-tube length. 20°C was preferable to Sporulation whereas conidial germination increased at 15°C. Results obtained from conidial germination in SD & Richard Solution media culture (RS) demonstrated no significant difference between 6, 11, 16, and 20-day old culture. However, the superiority of the 6-day old culture was remarkable in maintaining conidia germinability after 35 days of desiccation tolerance (at 20ºC, in the dark and 15% RH). Conidia harvested from 6-day old SD was suspended in Tween 20, coconut oil, and glycerol separately (0, 0.5, 1 and 2%). Germination rate and desiccation tolerance of the given spores were shown to be magnified in Tween1% v/v, coconut oil 0.5% v/v, and glycerol 2%. Combination of the two best performing adjuvants, Tween 20 (1%, v/v) and glycerol (2%, v/v), with pathogen (1 × 108 conidia ml -1) greatly enhanced disease on O.aegyptiaca.
  ICM9, Edinburg, UK; 01/2010
• Source

  Available from: Mitra Ghotbi

  Conference Proceeding: Evaluation of Cover Crops for Decreasing the Infestation of Egyptian broomrape (Orobanche aegyptiaca pers.)

  Mitra Ghotbi, Majid Amini Dehaghi, Marjan Ghotbi
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  ABSTRACT: Parasitic angiosperms of the genus Orobanche are a major constraint to agriculture in Africa and Asia inflicting devastating losses to farmers. Non chemical economical methods such as using cover crops could be an effective way to control this parasitic weed. Allelochemicals are present in almost all plants and in many tissues: leaves, stems, flowers, fruits, seeds and roots. Growing cover crops with allopathic characteristics is one of the ways to biologically control Egyptian broomrape (Orobanche aegyptiaca pers.). An experiment was conducted to compare effects of different crops on the germination rate of Egyptian broomrape seeds. Cotton, sesame, flax, maize, sunflower, castor, soy bean and sugar beet were grown in 2Kg pots containing sterile soil, infested with 0.9gr of Egyptian broomrape seeds. Control pots contained only 0.9gr of Egyptian broomrape. After 75 days plants were incorporated in to the soil and tomato seedlings were planted in the pots. Eighty days later the experiment was terminated by determining the number and dry weight of the Egyptian broomrape shoots and their capsules. Results showed a significant reduction in broomrape shoot number in pots which formerly contained cotton (cotton is a non-host which roots secrete Strigol a germination inducer of broomrape seeds). Comparison between means of tomato dry weight (root + shoot + leaves) showed an advantage of planting flax before tomato and a disadvantage of planting maize and sunflower.
  10th International Parasitic plants congress held in Cusadasi, Turkey, 8-12 June 2009, Cusadasi, Turkey; 01/2009