Factors affecting survival of microorganisms introduced into soil environments
1998
Senoo, K. (Mie Univ., Tsu (Japan). Faculty of Bioresources) | Nishiyama, M.
Environmental release of beneficial microorganisms, including genetically engineered ones, is a matter of concern in the field of bioremediation and improvement of crop production. Factors affecting survival and death of the microorganisms introduced into the environment, such as soil ecosystem, must be clarified to obtain effectively and safely the expected function of the microorganisms. Generally, microorganisms introduced into soil environment decrease in number with time, the decrease is mainly caused by the predatory activity of soil protozoa. Indigenous soil microorganisms survive for a long period in the microhabitats where they are protected against the attack of grazing protozoa. The artificial microhabitats, such as Microporous Glass and bentonite, offer protective microhabitats for the bacterium and are useful to increase the survival of bacterial inocula into soil. The pre-culture condition of bacterial inocula also affects their survival in soil. Starvation treatment of the bacterial cell s prior to inoculation improves their survival. This information must be considered when utilizing beneficial microorganisms in soil environments
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