Bioprospecting of facultatively oligotrophic bacteria from soils - Shen, Fo-Ting;Huang, Yu-Shiuan
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Conventional cultivation method relies on the use of nutrient-rich medium, which might limit the exploration of oligotrophic bacteria from soil ecosystems. In the present study attempts were made to isolate oligotrophic bacteria from non-rhizospheric samples collected from mountain roadside, beach, bay and wetland using 1000-fold diluted nutrient agar. All these isolates were subjected to phylogenetic and biogeographic studies. Tests for them to grow under various nutritional conditions, fix nitrogen or solubilize tricalcium phosphate were also conducted. A wide range of bacterial lineages…mehr

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Produktbeschreibung
Conventional cultivation method relies on the use of nutrient-rich medium, which might limit the exploration of oligotrophic bacteria from soil ecosystems. In the present study attempts were made to isolate oligotrophic bacteria from non-rhizospheric samples collected from mountain roadside, beach, bay and wetland using 1000-fold diluted nutrient agar. All these isolates were subjected to phylogenetic and biogeographic studies. Tests for them to grow under various nutritional conditions, fix nitrogen or solubilize tricalcium phosphate were also conducted. A wide range of bacterial lineages which mainly belonged to class Actinobacteria and -Proteobacteria were obtained. The methylotrophic, agarolytic and photoheterotrophic behaviors of some isolates were verified. Members affiliated with many genera were first demonstrated to possess plant growth promoting traits. In addition, the use of diluted medium helped to explore several unrecognized species from soils. All these facultatively oligotrophic bacteria may provide opportunities for soil microbiologist or ecologist to study their oligotrophic growth, metabolism and interaction with plants.
Autorenporträt
Dr. Fo-Ting Shen is an Assistant Professor working at National Chung Hsing University, Taichung, Taiwan. His research areas include soil microbiology, ecology and microbial diversity, systematics and molecular phylogeny, especially focusing on the exploration and characterization of agriculture and industry used microbial resources.