Biosafty
Negar Bagheri; Masoud Ahmadzadeh; Gholamreza Salehi Jouzani
Abstract
Co-inoculation of plant growth promoting bacteria and biological control agents, is a strategy to improve health, yield and quality of crop production. The objective of the present study was to evaluate interactions of two bacterial strains, Bacillus amyloliquefaciens UTB96 and Azospirillum oryzae NBT506, ...
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Co-inoculation of plant growth promoting bacteria and biological control agents, is a strategy to improve health, yield and quality of crop production. The objective of the present study was to evaluate interactions of two bacterial strains, Bacillus amyloliquefaciens UTB96 and Azospirillum oryzae NBT506, on growth promotion of wheat and control of the causal agent of Fusarium head blight, Fusarium graminearum. The results showed that single and co-culture of these strains inhibit mycelium growth of F. graminearum by direct inhibition and volatile organic compounds. In germinator assays, different wheat growth features were increased and disease index was decreased. Results showed that co-inoculation or single application of the bacteria in the soil significantly enhanced root length (14-80%), root fresh weight (18-167%), root dry weight (4-110%,), shoot length (17-61%), shoot fresh weight (47-169%) and shoot dry weight (up to 90%). In addition, a significant decrease in disease index (62-100%) was observed in different single and co-culture treatments. In conclusion, the studied two bacterial strains showed synergistic effects on wheat growth promotion and fungal growth inhibition.
Microbial Biotechnology
Farid Sarkamarian; Gholamreza Salehi Jouzani; Foad Moradi
Volume 5, Issue 9 , June 2015, , Pages 49-64
Abstract
The objective of the present study was to optimize fast production of enriched biocompost from sugarcane bagasse using native effective microorganisms and also other available materials. Four native bacterial strains with high hydrolase activities were produced at their optimized fermentation conditions. ...
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The objective of the present study was to optimize fast production of enriched biocompost from sugarcane bagasse using native effective microorganisms and also other available materials. Four native bacterial strains with high hydrolase activities were produced at their optimized fermentation conditions. The compost production experiments were performed in the format of completely randomized design (CRD). Bagasse, filter cake and vinasses were used as base materials in all treatments (exception for control). The microbial cocktail (106-107 cells/g waste), chicken manure or urea was used as improvers. The treatments were as follows: T1- chicken manure and microbial cocktail, T2-chicken manure, T3- urea and micronial cocktail, T4- urea, and T5- control (only bagasse). The maximum temperature increase (upo to 58°C), the maximum C/N ratio (15.9) and EC reductions was observed for T1, followed by T2. The highest phosphorous (1.1%), potassium (1%), total nitrogen (2%) and nitrate (210 mg/kg) and also the lowest ammonia (67 mg/kg) contents were observed in T1. Evaluation of the phytotoxicity effects of the produced composts on cress (Lepidium sativum) seeds germination showed that the fastest and maximum germination was observed for T1 and T2, respectively. The wheats cultured on the compost produced from T1 showed significantly higher height, and fresh and dry weights compared to other treatments. So, the results of the present study showed that the presence of microbial strains ans chicken manure enhanced a significant reduction inprocess period, compost maturity and finally production of high quality compost from sugarcane wastes.
Biotic and Abiotic stress
Gholamreza Salehi Jouzani; Sepideh Akbari Vala; Mehdi Sabet Jahromi; Hassan Morsali
Volume 1, Issue 1 , March 2012, , Pages 61-75
Abstract
Commonly, plant roots colonized by arbuscular mycorrhizal fungi (AMF) can tolerate different stresses such as soil salinity. Thereby, identification of the dominant AMF species in the saline soils and their application as biofertilizer is very useful for increasing crop productivity in such conditions. ...
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Commonly, plant roots colonized by arbuscular mycorrhizal fungi (AMF) can tolerate different stresses such as soil salinity. Thereby, identification of the dominant AMF species in the saline soils and their application as biofertilizer is very useful for increasing crop productivity in such conditions. For this purpose, sampling was performed from root and rhizosphere of wheat, barley and weeds in Yazd, East Azerbaijan, Qom and Markazi provinces. The morphological properties of spores of the isolated AMFs were studied. Then, samples were screened using a two steps nested PCR methodology. At the first step, AMF-specific primers, including LSU-Glom1 and SSU-Glom1 were used, followed by Alu1 restriction of PCR products, and then at the second step, the restricted PCR products were amplified by fungal universal primers (ITS4 and ITS5) for amplification of ITS-rDNA region. The PCR products were cloned, and restricted by Taq 1. The results of morphological charectreristics and analysis of the achived sequences and blasting showed that two AMF genus, including Glomus (more than 90%) and Acaulospora (10%) were domininat. The species G. mosseae (50%), G. intraradices, G. sinosum, G. constrictum, G. etunicatum, G. versiforme, G. fulvom, and Glomus sp were identified using molecular strategy. The maximum species diversity was observed in the fields of Yazd Province and rhizosphere of wheat. Totaly, results of the present study showed that the species G. mosseae has the highest dominancy and adaptivity in saline conditions, so after performing further experiments, it can be used as a source of biofertilizer in such regions.
