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| Home > Publications database > Microbial community structure in the rhizosphere of narrow-leafed lupin and tomato as related to nitrogen form provided |
| Home > Publications database > Microbial community structure in the rhizosphere of narrow-leafed lupin and tomato as related to nitrogen form provided |
| Poster (After Call) | FZJ-2015-06132 |
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2015
Abstract: Ammonia-oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) are the most important organisms responsible for ammonia and nitrite oxidation in agricultural ecosystems and growing media. Ammonia and nitrite oxidation are critical steps in the soil nitrogen cycle and can be affected by the application of mineral fertilizers or organic fertilizers. The microbial community and structure associated with the growing medium will also be influenced by the plant species identity. The functionality of the microbial community has a major impact on the nutrient turnover and will finally influence plant performance. In our study, we used two different plant species from different functional groups. Lupin, a legume that makes a nitrogen-fixing symbiosis with the microbial community and tomato, both with the availability to exudate nutrient mobilizing acids. We studied plant performance in rhizotrons (a phentotyping system for imaging roots), including an optical method (planar optodes) for non-invasive, quantitative and high-resolution imaging of pH dynamics in the rhizosphere and adjacent medium. The horticultural growing medium was supplemented with organic-derived nitrogen or ammonium derived from struvite. The possible differences in the root structure between treatments is compared with the total root length. Destructive growing medium sampling and high throughput sequencing analysis of the bacterial abundance of the communities present in the rhizosphere and the bulk soil will be used in order to study the growing medium-associated microbial community structure, and this will be related to pH changes in the rhizosphere and the bulk soil. Our hypothesis is that the growing medium-associated microbial community structure changes depending on the nitrogen form provided, the plant species used, the rhizosphere and bulk soil. We expect a higher abundance of bacteria in the treatment with organic fertilizer and a higher abundance of AOB and NOB in the rhizosphere in comparison to the bulk soil.
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