Microbial consortium increases maize productivity and reduces grain phosphorus concentration under field conditions |
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Authors: | Inês Pacheco Rodolfo Ferreira Patrícia Correia Luís Carvalho Teresa Dias Cristina Cruz |
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Affiliation: | 1. Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. Soilvitae Lda., Tec Labs – Centro de Inovação Campus da Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal |
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Abstract: | BackgroundThe use of microbes that improve plant phosphorus (P) use efficiency is an avenue to boost crop yields while alleviating environmental impacts. We tested three microbial inoculants (Rhizoglomus irregulare alone – designated AMF; Pseudomonas putida alone – designated PSB; and R. irregulare and P. putida in consortium – designated AMF+PSB), combined with chemical fertilizers, in an intensive maize agricultural system.ResultsAs hypothesized: (i) despite the native soil microbial community and the application of P fertilizer, the microbial inoculants enhanced plant P uptake from the soil by 14–60%, and consequently improved P acquisition efficiency; (ii) PSB and AMF+PSB plants produced ±50% more biomass per unit of P taken up, and consequently enhanced plant internal P use efficiency (i.e. the biomass produced per unit of P); and (iii) the combined inoculation of AMF and PSB provided the best results in terms of productivity and P use efficiency. Further, the microbial inoculants altered P allocation within the plant, reducing grain P concentration.ConclusionBy testing the microbial inoculants under field conditions, our study clearly shows that the microbial consortium (AMF+PSB) increased maize productivity, and at the same time improved P use efficiency. Further, the use of these microbial inoculants was shown to be compatible with conventional agricultural management practices. |
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Keywords: | Arbuscular mycorrhizal fungi Grain phytate Microbial consortium Phosphate solubilizing bacteria Phosphorus acquisition efficiency Plant internal phosphorus use efficiency |
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