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| Home > Publications database > Influence of nutrient and metal concentration on root exudation under waterlogged conditions |
| Home > Publications database > Influence of nutrient and metal concentration on root exudation under waterlogged conditions |
| Diploma Thesis | PreJuSER-14847 |
2011
Please use a persistent id in citations: http://hdl.handle.net/2128/4470
Abstract: The worldwide energy demand constantly increases and the search for regenerative alternatives is inevitable. A concept that exploits a bioenergy source in situ is the plant Microbial fuel cell (MFC). The plant-MFC uses the natural interplay between electrogenic bacteria in soil and plants to convert solar energy into green electricity. The interplay between bacteria and plant is based on the rhizodeposition of organic compounds into the rhizosphere. It is known, that low phosphate (P) content in the soil as well as a high Aluminum (Al) concentration can induce an enhanced exudation of organic compounds by plants into the rhizosphere. However, so far little is known about the factors that influence the rhizodeposition under waterlogged conditions. Thus, the aim of this study was to increase the exudation of several plants into the rhizosphere under waterlogged conditions by treating the plants with low P content or Al addition. Total organic carbon and inorganic carbon analyses indicated that a reduction of P supply induced a twofold increased release of organic compounds in waterlogged Spartina anglica, a threefold in Hemarthria altissima and a fivefold in Glyceria maxima plants. In contrast, the addition of Al did not affect the root exudation of any screened plant species. It is likely, that the screened plants use other mechanisms to detoxify the Al in the nutrient solution such as absorption into the symplasm or pH modifications of the rhizosphere. In future studies it should be tested, if a reduction of P in the plant-MFC is a possible tool to increase the productivity of the plant- MFC without affecting plant development and health.
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