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Influence of nutrient and metal concentration on root exudation under waterlogged conditions

Year: 2011
Type: dissertation
Abstract: The worldwide energy demand constantly increases and the search for regenerative\nalternatives is inevitable. A concept that exploits a bioenergy source in situ is the plant\nMicrobial fuel cell (MFC). The plant-MFC uses the natural interplay between electrogenic\nbacteria in soil and plants to convert solar energy into green electricity.\nThe interplay between bacteria and plant is based on the rhizodeposition of organic\ncompounds into the rhizosphere. It is known, that low phosphate (P) content in the soil as\nwell as a high Aluminum (Al) concentration can induce an enhanced exudation of organic\ncompounds by plants into the rhizosphere. However, so far little is known about the factors\nthat influence the rhizodeposition under waterlogged conditions. Thus, the aim of this study\nwas to increase the exudation of several plants into the rhizosphere under waterlogged\nconditions by treating the plants with low P content or Al addition. Total organic carbon and\ninorganic carbon analyses indicated that a reduction of P supply induced a twofold increased\nrelease of organic compounds in waterlogged Spartina anglica, a threefold in Hemarthria\naltissima and a fivefold in Glyceria maxima plants. In contrast, the addition of Al did not affect\nthe root exudation of any screened plant species. It is likely, that the screened plants use\nother mechanisms to detoxify the Al in the nutrient solution such as absorption into the\nsymplasm or pH modifications of the rhizosphere. In future studies it should be tested, if a\nreduction of P in the plant-MFC is a possible tool to increase the productivity of the plant-\nMFC without affecting plant development and health.
Language: English
Open Access status: green
OpenAlex ID: W2263306198
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