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Articles by S. Aghighi
Total Records ( 7 ) for S. Aghighi
  M. Kalantar Zadeh , G.H. Shahidi Bonjar , P. Rashid Farrokhi , A. Ghasemi , S. Aghighi and M.J. Mahdavi
  Streptomyces scabies and S. acidiscabies, the two major phytopathogens induce potato common scab in potato growing areas of Iran. Soil Actinomycetes including 174 isolates were assayed for assessing antagonistic activity against Streptomyces scabies and S. acidiscabies. From tested isolates, S. olivaceus, strain 115 and S. plicatus, strain 101 showed high anti-scab activity revealed by bioassays in agar disk and well diffusion methods. For further biological characterizations, the active strains were grown in submerged cultures to determine growth curve and prepare crude extracts. Preliminary greenhouse studies indicated that amending soil with the S. olivaceus, strain 115 and S. plicatus strain 101 reduce crop losses due to the pathogens. Antibacterial activities of both antagonists were of bactericidal type on both pathogens with complete inhibitory effects.
  S.A. Ayatollahi Mousavi , E. Khalesi , G.H. Shahidi Bonjar , S. Aghighi , F. Sharifi and F. Aram
  Rapid identification of Candida species in clinical laboratory is becoming increasingly important since the incidence of Candidiasis continues to rise as the hospital surveys show. Molecular techniques utilizing amplification of target DNA provide quick and precise methods for diagnosis and identification of Candida species. In this study, using universal primers, the ITS1-ITS4 region was amplified. The restriction enzyme MspI digests this region and was used to identify of C. albicans, C. glabrata, C. krusei, C. tropicalis and C. guilliermondii. Electrophoretically, ribosomal DNA of C. guilliermondii produced three bands whereas the other species gave two bands upon digestion. Accordingly these enzymes behave as valuable application tools in molecular diagnosis of Candida species in Candidiasis maladies and can be substituted with the classical diagnosis of the pathogen.
  G.H. Shahidi Bonjar , S. Aghighi and A. Karimi Nik
  Methanol plant-extracts of 221 species from 98 families which had documented uses in Iranian herbal-medicine were screened for antibacterial and antifungal activity against 11 standard bacterial strains and 3 fungal species at 20 mg mlG1. Eighty one samples in 39 families showed antibacterial and/or antifungal activity against at least on one of the tested microorganisms. Antimicrobial activities were evaluated by measuring the diameter of inhibition zones in agar well diffusion method. Dianthus coryophyllus was active against all tested G-ve and G+ve bacteria except Micrococcus luteus. Most susceptible G-ve bacteria were Klebsiella pneumoniae and Bordetella bronchiseptica and least susceptible was Escherichia coli. In G+ve bacteria, most and least susceptible were Staphylococcus aureus and Micrococcus luteus, respectively. Plants with high antifungal activity included Alpinia officinarum, Chrozophora verbasafalia, Cinnamomum zeylanicum, Dianthus coryophyllus, Helleborus nigra, Heracleum persicum, Myrtus communis, Terminalia chebula and Trachysermum copticum which were effective mostly against Candida albicans and C. utilis.
  G.H. Shahidi Bonjar , S. Zamanian , S. Aghighi , P. Rashid Farrokhi , M.J. Mahdavi and I. Saadoun
  Ralstonia solanacearum has worldwide economical importance because of its destructive and soil-borne nature. Clearly chemical measures have lost their attractiveness because of development of resistant strains and undesirable effects on our environment. Consequently, biological control of pathogens is gaining great importance worldwide. To investigate for proper biocontrol agents and to obtain antibacterial antagonists from Iranian soil Actinomycetes, a vast survey was performed. Over 170 isolates of soil Actinomycetes were isolated and screened among which one isolate showed high level of activity in Agar disk and Well diffusion methods against R. solanacearum. It was identified as Streptomyces coralus strain 63. High concentration of antibacterial agent was detected at 8-11th day in shake cultures. Longevity in vitro of the active crude in soluble state determined about 40 days at room temperature. In thermal inactivation point studies, active crude retained activity up to 93°C. Antibacterial activity of the antagonists found in this study highlights their importance as candidates for further investigation in biological control of tested pathogenic bacteria.
  Sadeghi, A. , A.R. Hessan , H. Askari , S. Aghighi and G.H. Shahidi Bonjar
  Biological control of sugar beet damping-off of Rhizoctonia solani by two Streptomyces isolates (S2 and C) was evaluated in this study. The in vitro antagonism assays showed that active isolates had inhibitory effects on mycelium growth of the three R. solani AG-4 isolates (Rs1, Rs2 and Rs3). Soil treatment either with isolate S2 or C formulation inhibited the disease completely and increased seedling stand in infected and uninfected treatments significantly (p<0.05). Compared to controls, all treatments containing bacteria had enhanced shoot and root dry weight and root density. Both bacterial isolates maintained normal growth in pH ranges of 5.6, 7.2 and 8.0 at 29°C. Isolate C grew in pH ranges 5.6, 7.2 and 8.0 at 23-37°C, isolate S2 grew at 18-37°C in pH 5.6-8.0 but did not grow in acidic medium at 37°C. When pH decreased to 5.0, growth of C decreased and S2 inhibited. To elucidate the mode of antagonism, chitinase activity and siderophore production were evaluated. Both isolates showed chitinase activity on medium containing colloidal chitin. Biosynthesis of siderophore was detectable in isolate C but not in S2. The results of this study showed that these isolates had antifungal activities by production of siderophore and chitinase.
  F. Sharifi , P. Rashid Farrokhi , G.H. Shahidi Bonjar , S. Aghighi , F. Aram and E. Khalesi
  Actinomycetes enhance soil fertility and have antagonistic activity against wide range of plant root-pathogens. These micro organisms were isolated from agricultural soils of Kerman and Fars Provinces as pure cultures. Pythium aphanidermatum, causes damping off and root and stem rots of cucurbits worldwide. From 178 Actinomycetes isolates, 43 inhibited growth of the pathogen in culture plates and two of the most active isolates exhibited biological control of the pathogen under greenhouse conditions. When plants were grown in sterile soil mix and treated both with Actinomycetes and the pathogen, the number of healthy plants increased dramatically and the symptoms on diseased plants were less severe in comparison with seedlings treated with the pathogen alone. From the collected data it was well conclusive that in greenhouse tests, soil applications of Actinomycetes controlled causal agent of damping off in cucurbit seedlings. Antifungal activity was of fungicidal type on the pathogen mycelia. Regarding biotechnological implications, the results indicate that the active isolates can be investigated for use as biofertilizers, biofungicides and use in future development of recombinant DNA in cucurbits bearing elevated resistance to damping off. Field trials of the active isolates are under investigation.
  F. Sharifi , G.H. Shahidi Bonjar , S. Aghighi , P. Rashid Farrokhi , E. Khalesi , M.J. Mahdavi and H. Taraz
  Pythium aphanidermatum, the major phytopathogen induce damping off, root and stem rots, blights of grasses and fruit and in greenhouse cucurbits growing all areas of the world. Soil Actinomycetes including 178 isolates were assayed for assessing antagonistic activity against P.aphanidermatum. From tested isolates, 43 isolates were effective but 2 isolates strains 311 and 321 showed high anti-fungal activity revealed by bioassays in agar disk and well diffusion methods. For further biological characterizations, the active strains were grown in submerged cultures to determine growth curve and prepare crude extracts. Preliminary greenhouse studies indicated that amending soil with these strains, 311 and 321; reduce crop losses due to the pathogen. Antifungal activities of both antagonists were of fungicidal type on pathogen with complete inhibitory effects.
 
 
 
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