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Articles by B. Peivastegan
Total Records ( 4 ) for B. Peivastegan
  I. Hadizadeh , B. Peivastegan and H. Hamzehzarghani
  Problem statement: Increasing public concern over the level of pesticide residues in food especially fresh produce has built up adequate pressure for scientists to look for less hazardous and environmentally safer compounds for controlling post harvest diseases. Essential oils as registered food grade materials have the potential to be applied as alternative anti-fungal treatments for fresh fruits and vegetables. Approach: We present in this study, the identification of the essential oils with antifungal activity from some medicinal plants of Iran (nettle (Urtica dioica L.), thyme (Thymus vulgaris L.), eucalyptus (Eucalyptus spp.), Rue (Ruta graveolens L.) and common yarrow (Achillea millefolium L.)), and their potential application as "generally regarded as safe" antifungal compounds against Alternaria alternate on tomato as a model pathosystem. Results: Both the nettle and the thyme oils exhibited antifungal activity against A. alternata. The thyme oil exhibited a lower degree of inhibition 68.5 and 74.8% at 1500 and 2000 ppm, respectively. Spore germination and germ tube elongation of the pathogens in potato dextrose broth was strongly reduced in the presence of 1500 ppm of the nettle oil. The same concentration of this oil reduced the percentage of decayed tomatoes. The experiments on reducing the development of natural tomato rot gave similar results. Conclusions: Application of essential oils for postharvest disease control of fresh produce, as a novel emerging alternative to hazardous anti-fungal treatments will allow a safer and environmentally more acceptable management of postharvest diseases.
  M. Kolahi , B. Peivastegan , I. Hadizadeh and S.M. Seyyednejad
  In this study, phytotoxicity of rice hull extracts (Oryza sativa L.) on wild oat (Avena ludoviciana Durieu) was investigated. Hull extracts from 13 cultivated rice cultivars (Oryza sativa L.) were used to determine their allelopathic potential on seed germination and seedling growth of wild oat (Avena ludoviciana Durieu). The allelopathic effects of water hull extracts from selected cultivars were investigated. In the screening the Red anbarbo extract inhibited germination 24% very closely fallowed Daniyal is 27%. Seedling growth bioassays demonstrated that the wild-oat (Avena ludoviciana Durieu) responded differently to the allelopathic potential of rice. For wild-oat (Avena ludoviciana Durieu) shoot length and germination were more depressed than root length. Some hulls extracts including Champa, Sahel almost didn’t affect root length. The greatest total seedling length inhibition was from the Daniyal extracts. Extract of rice hulls significantly reduced roots length of wild oat. Extracts of Daniyal reduced root length of wild oat by 2.19 cm. This cultivar have the highest inhibitory on root length of wild oat. These results suggest that rice hull extracts may be a source of natural herbicide. There may be genetic differences among rice cultivars for allelopathic potential on Wild-oat. The breeding of rice cultivars with greater allelopathic potential may be possible.
  M. Kolahi , B. Peivastegan , I. Hadizade and A. Abdali
  Phytotoxicity of barley extracts (Hordeum vulgare L.) on wild oat (Avena ludoviciana Durieu) was investigated. Water extracts five varieties of barley were bioassayed on germination and seedling growth of wild-oat to test the heterotoxicity of barley on wild-oat, study the dynamics of allelopathic potential over four growth stages and identify the most allelopathic plant part of barley in each stage. Whole barley plants were extracted at growth stage 4 (stems not developed enough), whilst for the following growth stages roots, stems, panicles and leaves were extracted separately. Seedling growth bioassays demonstrated that the wild-oat responded differently to the allelopathic potential of barley. For wild-oat radical growth and coleoptile growth were more depressed than germination, though. The allelopathic potential of barley plant parts was not stable over its life cycle for wild-oat. Leaves and stems were the most phytotoxic barley plant parts for wild-oat in the all stages. Among the varieties Eizeh appeared as the best one showing toxicity to seed germination of wild oat at its stage 4 and 8. Results suggested that the response by wild-oat varied depending on the source of allelochemicals (plant part) and the growth stage of the barley plant and kind of variety. The results leaded to conclude that Eizeh variety of barley was good to grow as it has good check on seed germination of wild oat plants as well as it also retarded the growth of root and shoot length of oat.
  I. Hadizadeh , B. Peivastegan and M. Kolahi
  Anti-mycotic activity of the ethanol extracts from Nettle (Urtica dioica L.), Colocynth (Citrullus colocynthis L. Schrad), Konar (Ziziphus spina-christi L.) and Oleander (Nerium oleander L.) floral parts were screened in vitro against four important plant pathogenic fungi viz., Alternaria alternate, Fusarium oxysporum, Fusarium solani and Rizoctonia solani using agar dilution bioassay. Extracts showed antifungal activity against all the tested fungi. Among the plants, Nettle and Colocynth were the most effective against A. alternate and R. solani while Oleander possesses the best inhibition on F. oxysporum and F. solani. Konar was the most effective extract by reducing the growth of Rizoctonia solani than other fungi. These results showed that extracts could be considered suitable alternatives to chemical additives for the control of fungal diseases in plants.
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