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| 100 | 1 | _ | |a Kuang, Weiqi |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a N-dependent dynamics of root growth and nitrate and ammonium uptake are altered by the bacterium Herbaspirillum seropedicae in the cereal model Brachypodium distachyon |
| 260 | _ | _ | |a Oxford |c 2022 |b Oxford Univ. Press |
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| 520 | _ | _ | |a Nitrogen (N) fixation in cereals by root-associated bacteria is a promising solution for reducing use of chemical N fertilizers in agriculture. However, plant and bacterial responses are unpredictable across environments. We hypothesized that cereal responses to N-fixing bacteria are dynamic, depending on N supply and time. To quantify the dynamics, a gnotobiotic, fabricated ecosystem (EcoFAB) was adapted to analyse N mass balance, to image shoot and root growth, and to measure gene expression of Brachypodium distachyon inoculated with the N-fixing bacterium Herbaspirillum seropedicae. Phenotyping throughput of EcoFAB-N was 25–30 plants h−1 with open software and imaging systems. Herbaspirillum seropedicae inoculation of B. distachyon shifted root and shoot growth, nitrate versus ammonium uptake, and gene expression with time; directions and magnitude depended on N availability. Primary roots were longer and root hairs shorter regardless of N, with stronger changes at low N. At higher N, H. seropedicae provided 11% of the total plant N that came from sources other than the seed or the nutrient solution. The time-resolved phenotypic and molecular data point to distinct modes of action: at 5 mM NH4NO3 the benefit appears through N fixation, while at 0.5 mM NH4NO3 the mechanism appears to be plant physiological, with H. seropedicae promoting uptake of N from the root medium.Future work could fine-tune plant and root-associated microorganisms to growth and nutrient dynamics. |
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| 700 | 1 | _ | |a Sanow, Stefan |0 P:(DE-Juel1)178056 |b 1 |
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| 700 | 1 | _ | |a Müller Linow, Mark |0 P:(DE-Juel1)142555 |b 3 |
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| 773 | _ | _ | |a 10.1093/jxb/erac184 |g p. erac184 |0 PERI:(DE-600)1466717-4 |n 15 |p 5306–5321 |t The journal of experimental botany |v 73 |y 2022 |x 0022-0957 |
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