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Studies on Possible Modes of Action and Tolerance to Environmental Stress Conditions of Different Biocontrol Agents of Foliar Diseases in Maize

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Agricultural Sciences 2020年第6期11卷 552-566页

作者： Melina Sartori Martín Bonacci Paula Barra aluminé fessia Miriam Etcheverry Andrea Nesci Germán Barros Laboratorio de Ecología Microbiana Ambiental (ECOMA) Departamento de Microbiología e Inmunología Facultad de Ciencias Exactas Universidad Nacional de Río Cuarto Córdoba Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Buenos Aires Argentina

The present study evaluates the possible modes of action of antagonistic bacteria and their tolerance to UV radiation, temperature and osmotic stress. The partial 16S-23S rRNA gene sequencing of eight antagonistic bacteria had a high match with three bacterial genera: Curtobacterium, Pantoea and Bacillus. In this study, the three Bacillus isolates showed the most relevant production of enzymes, volatile organic compounds and antibiosis against Exserohilum turcicum. Respect to UV radiation and temperature Pantoea and Bacillus isolates were more tolerant;whereas the eight isolates were tolerant to osmotic stress in varying degree. The three Bacillus isolates have the greatest potential as biocontrol agents for foliar diseases in maize. The antagonistic action could be explained through different modes of action such as enzymes, volatile organic compounds and/or direct antibiosis by other secondary metabolites. Bacillus isolates tolerance to environmental stresses including UV radiation, temperature and osmotic stress is relevant for survival and persistence on the leaf surface. This work provides new information about the mode of action of antagonistic bacteria with proven efficacy against maize leaf pathogens. In addition, it provides information about the tolerance of antagonistic bacteria against different stress conditions. The data of the present study could contribute to the development of a successful foliar biofungicide.

关键词： Biocontrol Maize Antagonistic Bacteria Bacillus Exserohilum turcicum

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TREATMENT OF INDUSTRIAL WASTEWATER FROM AN aluminA PLANT BY MEMBRANE TECHNOLOGY(Ⅱ) ——Study on Technological Process

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Journal of Central South University 1999年第2期11卷 86-89页

作者： Zhou Kanggen Zhang Qixiou Luo Aiping (Department of Metallurgical Science and Engineering, Central South University of Technology, Changhsha 410083, China) Fu Chunsheng Xiang Jihong Li Ming (Department of Technology & Resources, Shanxi alumin 1. Department of Metallurgical Science and Engineering Central South University of Technology 410083 Changhsha China 2. Department of Technology & Resources Shanxi Aluminum Company 043300 Hejin China 3. Environmental Protection Monitoring Station of Light Industry 214035 Wuxi

The experimental results of producing deionized water for the themoelectric factory from two types of the industrial wastewater of an alumina plant by using membrane technology are reported in this paper. For the treatment of the industrial wastewater with high salinity and pH value, the combination of electrodialysis (ED) and reverse osmosis (RO) is utilized, while for the treatment of the low salinity wastewater with low pH value, RO is directly used. The research results show that the above mentioned methods are effective. The technological process of the wastewater treatment with the capacity of 120 tons is designed on the basis of the experimental results.

关键词： membrane separation electrodialysis reverse osmosis alumina production wastewater treatment

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