Plant/microbe cooperation for electricity generation in a rice paddy field
Plant/microbe cooperation for electricity generation in a rice paddy field
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DOI：
10.1007/s00253-008-1410-9
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发表时间：
2008-05-01
影响因子：
5
通讯作者：
Watanabe, Kazuya
中科院分区：
文献类型：
--
作者：
Kaku, Nobuo;Yonezawa, Natsuki;Watanabe, Kazuya
土壤中含有丰富的有机物，特别是那些支持植物生长的有机物。这些有机物是可持续能源的可能来源，微生物燃料电池(MFC)系统可能用于这一目的。在这里，我们报告了MFC系统在稻田发电中的应用。在我们的系统中，使用了石墨毡电极，在水稻根际设置了一个阳极，在根际上方的洪水中设置了一个阴极。观察到发电量(高达6 mW/m(2)，归一化到阳极投影区)依赖于阳光，并表现出昼夜振荡。白天人工遮荫抑制了水稻的发电量。在根际，水稻根穿过阳极石墨毡，在那里出现特定的细菌种群。在阳极区添加醋酸盐(一种主要的消耗根的有机化合物)可以增强黑暗中的发电量。这些结果表明，稻田发电系统是一个生态太阳能电池，其中植物的光合作用与微生物将有机物转化为电能的过程相耦合。
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.