Plant/microbe cooperation for electricity generation in a rice paddy field
| Autor: | Yumiko Kodama, Kazuya Watanabe, Nobuo Kaku, Natsuki Yonezawa |
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| Rok vydání: | 2008 |
| Předmět: |
Crops
Agricultural DNA Bacterial Energy-Generating Resources Microbial fuel cell Sodium Acetate Photosynthesis Plant Roots Applied Microbiology and Biotechnology Electricity Bioenergy Symbiosis Electrodes Rhizosphere Environmental engineering food and beverages Oryza Sequence Analysis DNA General Medicine Circadian Rhythm Anode Electricity generation Agronomy Biofuel Sunlight Environmental science Paddy field Water Microbiology Biotechnology |
| Zdroj: | Applied Microbiology and Biotechnology. 79:43-49 |
| ISSN: | 1432-0614 0175-7598 |
| DOI: | 10.1007/s00253-008-1410-9 |
| Popis: | Soils are rich in organics, particularly those that support growth of plants. These organics are possible sources of sustainable energy, and a microbial fuel cell (MFC) system can potentially be used for this purpose. Here, we report the application of an MFC system to electricity generation in a rice paddy field. In our system, graphite felt electrodes were used; an anode was set in the rice rhizosphere, and a cathode was in the flooded water above the rhizosphere. It was observed that electricity generation (as high as 6 mW/m(2), normalized to the anode projection area) was sunlight dependent and exhibited circadian oscillation. Artificial shading of rice plants in the daytime inhibited the electricity generation. In the rhizosphere, rice roots penetrated the anode graphite felt where specific bacterial populations occurred. Supplementation to the anode region with acetate (one of the major root-exhausted organic compounds) enhanced the electricity generation in the dark. These results suggest that the paddy-field electricity-generation system was an ecological solar cell in which the plant photosynthesis was coupled to the microbial conversion of organics to electricity. |
| Databáze: | OpenAIRE |
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