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Showing 5 results for Behboudi


Volume 10, Issue 2 (2-2021)
Abstract

Biocontrol agents have different growth and biocontrol responses under the influence of physicochemical parameters. The culture medium is one of these parameters. Therefore, in this study, the effects of eight liquid media were investigated on the growth and antagonistic efficacy of Trichoderma harzianum Tr6 against Phytophthora drechsleri. Tr6 at 108 spores per ml was grown in these media. All media pH was set at 5.5. Treatments were maintained under a light intensity of 206 Lux and 130 rpm at 28 °C for 10 days. Maximum sporulation (2.5 × 1010 spore/g.dw) occurred in Mol. C. (Sugar beet molasses and Corn steep liquor) medium. The most inhibition against pathogen was related to Mol. M. (Sugar beet molasses and Malt extract) medium. Mol. M. and Mol. B. (Sugar beet molasses and Baker yeast) had the most effect on disease reduction (58.33%). Mol. M. had not superlative effect on plant growth factors but had a better effect compared with other treatments except Mol. Y. (Sugar beet molasses and Yeast extract). The following assays were done to simultaneously select the optimum medium for high sporulation, effective control of disease, and plant growth promotion. Therefore, Mol. M., Mol. B., Mol. C., and Mol. C. B. M. media were used. Mol. C., Mol. C. B. M. and Mol. M. had the highest spore production with 2.35 × 1010, 1.83 × 1010, and 1.65 × 1010 spore/gdw, respectively. There was no significant difference between the Mol. C. B. M. and Mol. M. Furthermore, Mol. C. B. M. reduced disease by 62.5%, but this reduction was not significantly different from Mol. M. and Mol. B. Therefore, Mol. M. medium had the most influence on growth and biocontrol performance of Tr6.
Davood Behboudi, Hossein Asgharpur Asgharpur, Faranak Bastan, Yazdan Seif,
Volume 13, Issue 3 (Autumn 2013 2013)
Abstract

In oil-abundant countries, oil revenues, due to various reasons such as mismanagement, can influence the economic and social conditions and hinder development. This paper examines the relationship between oil revenues and social capital in Iran during 1976-2007. To do this, the Autoregressive Distributed Lags (ARDL) approach and bound testing approach for co-integration are used to analyze data and estimate the model. The results indicate that oil revenues as an indicator for abundance of the natural resources have significant and negative influence on social capital. In addition, GDP per capita has positive impact on social capital in Iran.  

Volume 13, Issue 6 (Number 6 - 2011)
Abstract

Biotic as well as abiotic factors may influence the biocontrol activity and population density of Pseudomonas fluorescens. However, limited studies have been carried out on the effects of extracellular metabolites of other competitor bacteria, especially on the biocontrol efficiency of P. fluorescens. A greenhouse experiment was conducted to evaluate the potential of the two P. fluorescens isolates UTPF68 & UTPF109 in the biocontrol of bean damping-off caused by Rhizoctonia solani (AG-4), when applied individually or in combination with the culture filtrates of five rhizobia isolates (RH3 to RH7). Although all treatments reduced bean damping-off severity in comparison with the untreated control, RH4 + UTPF109 gave the lowest severity of damping-off (0.56 ,<1%). Beside the effect on disease control, seeds treatment with both P. fluorescens isolates individually or in combined treatments especially RH4+UTPF109 and RH6+UTPF68 significantly improved bean growth factors such as shoot and root fresh/dry weights. On the other hand, all tested rhizobia and P. fluorescens isolates especially, RH4, proved to be siderophore, HCN, IAA, and exopolysaccharide producers. Also, all tested bacteria except RH5 and RH7 produced chitinase. Furthermore, our in vitro studies demonstrated that the filtrates of tested rhizobia isolates can effectively increase the population density of both P. fluorescens isolates as a biotic factor. Thus, certain rhizobia seem to have a capacity to interact synergistically with P. fluorescens isolates having potential biocontrol activity.

Volume 20, Issue 7 (Supplementury Issue 2018)
Abstract

Silicon (Si) and its derivatives have beneficial effects on a wide variety of plant species, especially under both biotic and abiotic stresses. Yet, their effects on wheat (Triticum aestivum L.) plants under drought stress are not well known. Therefore, in order to evaluate the effects of SiO2 NanoParticles (NPs) under drought stress, wheat seeds were separately sown in pots. Then, the SiO2 NPs were added to them through soil and foliar application at three stages of plant growth. Results indicated that drought stress significantly decreased majority of the studied traits compared to the normal irrigation. Soil application of NPs, under drought stress, significantly increased leaf greenness (SPAD) and Relative Water Content (RWC) by 12.54 and 84.04%, respectively, compared to the control (NPs= 0 ppm). Moreover, under drought stress, wheat yield also increased by 25.35 and 17.81%, respectively, by foliar and soil application of NPs. Under the same irrigation regimes, soil application of NPs significantly increased plant height and biomass compared to the foliar application of NPs. Finally, our results highlight that usage of the SiO2 NPs, especially at rates of 30 and 60 ppm, can mitigate adverse effects of drought stress in wheat plants.
 
Mrs Zahra Azari, Dr Parviz Mohamadzadeh, Dr Davoud Behboudi,
Volume 24, Issue 4 (Winter 2024)
Abstract

Aim and Introduction
The importance of poverty and dealing with that is so critical that poverty alleviation is the first goal in the Millennium Development Goals (MDGs) and the United Nations Sustainable Development Goals (SDGs). Therefore, it is essential to be aware of the poverty dynamics and the mechanisms involved to influence such parameters. The purpose of this research is to identify the factors affecting poverty in Iran and analyzing the interactive mechanisms of the factors that cause poverty in the country. This study emphasizes the fact that knowing the factors affecting poverty and the mechanisms of influencing these factors can have a significant impact on alleviating poverty.
Methodology
The current study is applied research in terms of purpose, and analytical-exploratory research in terms of information analysis. The data collection tool is semi-structured and in-depth interviews. Since the purpose of this study is to identify the factors affecting poverty in
Iran from the point of view of experts on Iran's economic, social and political issues, the samples were selected and interviewed using theoretical sampling under the snowball method. By conducting 16 interviews, the research reached theoretical saturation. In order to ensure that the subsequent interviews do not add new information to the previous findings, 4 more interviews were conducted, but no new information was added to the previous findings. Therefore, theoretical saturation was ensured by conducting 20 interviews and the target study sample was 20 cases. After identifying experts and conducting deep and semi-structured interviews, thematic analysis method was applied. This analysis is the process of identifying themes in qualitative data. In this method, a suitable conceptual model is obtained using qualitative data obtained from interviews. It should be noted that the MAXQDA software is used for coding the interviews. Finally, the specified codes were categorized and analyzed in the form of factors affecting poverty in the country. Also, in order to show the complex relationships between factors affecting poverty in iran in the form of main and sub-themes, a qualitative dynamic approach and feedback loops were used in the Vensim 6.4E software environment. In this study, an approach is needed that can reflect the relationship of factors affecting poverty in its formation. Therefore, the relationships between the main and sub-themes extracted from the thematic analysis of expert interviews are depicted with a dynamic view. This method is a tool to show cause and effect relationships about a problem in society. This approach maps the relationships of a set of variables involved in a system. The relationship between system variables is displayed using causal loops.
Findings
In recent decades, despite the fact that the debate on poverty and poverty alleviation strategies has been raising in the world, and in some countries, basic measures have been taken to reduce income poverty and multi-dimensional poverty have taken place, not only has the situation not improved in Iran, but the country is facing huge crises in this field.
In this study, the factors affecting poverty in Iran have been presented in the form of four main themes of political, cultural, production and educational structure.
Cultural structure: cultural structure is a force that determines, realizes, facilitates and empowers or inhibits, binds or hinders action. Cultural structure identified in the interviews has been classified into two categories: the mental paradigms of actors (people and officials) and the culture of poverty.
Political structure: the elements related to the political structure identified among the experts' interviews have had a significant effect on poverty in Iran by reducing economic growth and creating inequality. These elements include: limited access orders, the presence of subordinate institutions in the economy, political isolation, lack of guarantee of property rights, lack of transparency in access to information, lack of freedom of expression in the press, rent, lack of a strong mechanism for monitoring, weak labor unions, government unresponsiveness, weak local government, not believing in law and legislation, and finally, the lack of education in demanding in schools and universities.
Educational structure: in relation to the interaction between education and poverty, it can be acknowledged that without adequate education and appropriate for the society, the individual and the society are limited to a poor life. Sen states that inadequate education in itself can be considered a form of poverty in many societies.
Production structure: the elements related to the production structure that were extracted from coding are: false beliefs due to unfavorable conditions, weakness in production culture, non-guaranteeing of property rights, political isolation, erosion of social capital, elimination of comparative advantage in production, corrupt monetary and banking system, presence of institutions subordinate to power in the economy, lack of written program in production, centralization in the center of the country and the environment of rentier economy.
Discussion and Conclusion
Contrary to the opinion of many officials and people of the society, poverty is not a simple and linear problem, but a complex and systemic disease. There is no specific problem in a system and all problems are related. According to the aggregated model and the self-reinforcing causal relationship, to break the causal relationships, planned policies in the form of main and sub-themes are suggested as follows:
Ensuring property rights for a large part of society, so that different people are motivated to invest and participate.
Proper use of the potentials of each region to create added value.
Recovery of international relations


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