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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Claims 5
Claim · model-written summary
Reduced phosphorus supply doubled organic compound release by Spartina anglica.
- Taxon
- Spartina anglica
Sporobolus anglicuse0 - Treatment
- reduction of P supplye0
- Outcome
- release of organic compoundse0
- Direction
- increasede0
- Value
- twofolde0
- Qualifier
- waterloggede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction of P supply induced a twofold increased release of organic compounds in waterlogged Spartina anglica”
Claim · model-written summary
Reduced phosphorus supply tripled organic compound release by Hemarthria altissima.
- Taxon
- Hemarthria altissima
Hemarthria altissimae0 - Direction
- increaseinferrede0
- Value
- threefolde0
Not reportedTreatmentComparatorOutcome
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a threefold in Hemarthria altissima”
Claim · model-written summary
Reduced phosphorus supply increased organic compound release fivefold in Glyceria maxima.
- Taxon
- Glyceria maxima
Glyceria maximae0 - Direction
- increaseinferrede0
- Value
- fivefolde0
Not reportedTreatmentComparatorOutcome
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a fivefold in Glyceria maxima plants.”
Claim · model-written summary
Aluminium addition did not affect root exudation in screened plants.
Not reportedComparator
Verbatim
e0“the addition of Al did not affect the root exudation of any screened plant species.”
Claim · model-written summary
The authors hypothesized alternative aluminium detoxification mechanisms.
- Taxon
- plantsViridiplantaee0
- Outcome
- detoxify the Ale0
- Qualifier
- absorption into the symplasm or pH modifications of the rhizospheree0
Verbatim
e0“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.”