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000908268 1001_ $$0P:(DE-HGF)0$$aKuang, Weiqi$$b0
000908268 245__ $$aN-dependent dynamics of root growth and nitrate and ammonium uptake are altered by the bacterium Herbaspirillum seropedicae in the cereal model Brachypodium distachyon
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000908268 520__ $$aNitrogen (N) fixation in cereals by root-associated bacteria is a promising solution for reducing use of chemical N fertilizers in agriculture. However, plant and bacterial responses are unpredictable across environments. We hypothesized that cereal responses to N-fixing bacteria are dynamic, depending on N supply and time. To quantify the dynamics, a gnotobiotic, fabricated ecosystem (EcoFAB) was adapted to analyse N mass balance, to image shoot and root growth, and to measure gene expression of Brachypodium distachyon inoculated with the N-fixing bacterium Herbaspirillum seropedicae. Phenotyping throughput of EcoFAB-N was 25–30 plants h−1 with open software and imaging systems. Herbaspirillum seropedicae inoculation of B. distachyon shifted root and shoot growth, nitrate versus ammonium uptake, and gene expression with time; directions and magnitude depended on N availability. Primary roots were longer and root hairs shorter regardless of N, with stronger changes at low N. At higher N, H. seropedicae provided 11% of the total plant N that came from sources other than the seed or the nutrient solution. The time-resolved phenotypic and molecular data point to distinct modes of action: at 5 mM NH4NO3 the benefit appears through N fixation, while at 0.5 mM NH4NO3 the mechanism appears to be plant physiological, with H. seropedicae promoting uptake of N from the root medium.Future work could fine-tune plant and root-associated microorganisms to growth and nutrient dynamics.
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000908268 7001_ $$0P:(DE-Juel1)178056$$aSanow, Stefan$$b1
000908268 7001_ $$0P:(DE-Juel1)164816$$aKelm, Jana M$$b2
000908268 7001_ $$0P:(DE-Juel1)142555$$aMüller Linow, Mark$$b3
000908268 7001_ $$0P:(DE-HGF)0$$aAndeer, Peter$$b4
000908268 7001_ $$0P:(DE-Juel1)140195$$aKohlheyer, Dietrich$$b5
000908268 7001_ $$0P:(DE-HGF)0$$aNorthen, Trent$$b6
000908268 7001_ $$0P:(DE-HGF)0$$aVogel, John P$$b7
000908268 7001_ $$0P:(DE-Juel1)166460$$aWatt, Michelle$$b8
000908268 7001_ $$0P:(DE-Juel1)165155$$aArsova, Borjana$$b9$$eCorresponding author
000908268 773__ $$0PERI:(DE-600)1466717-4$$a10.1093/jxb/erac184$$gp. erac184$$n15$$p5306–5321$$tThe journal of experimental botany$$v73$$x0022-0957$$y2022
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