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Microbial consortium increases maize productivity and reduces grain phosphorus concentration under field conditions

Publication . Pacheco, Inês; Ferreira, Rodolfo; Correia, Patrícia; Carvalho, Luis M; Dias, Teresa; Cruz, Cristina

Background:The use of microbes that improve plant phosphorus (P) use efficiency is an avenue to boostcrop yields while alleviating environmental impacts. We tested three microbial inoculants (Rhizoglomusirregularealone – designated AMF;Pseudomonas putidaalone – designated PSB; andR. irregulareandP. putidain consortium – designated AMF+PSB), combined with chemical fertilizers, in an intensive maizeagricultural system.Results:As hypothesized: (i) despite the native soil microbial community and the application of P fertil-izer, the microbial inoculants enhanced plant P uptake from the soil by 14–60%, and consequentlyimproved P acquisition efficiency; (ii) PSB and AMF+PSB plants produced ±50% more biomass per unitof P taken up, and consequently enhanced plant internal P use efficiency (i.e. the biomass producedper unit of P); and (iii) the combined inoculation of AMF and PSB provided the best results in terms ofproductivity and P use efficiency. Further, the microbial inoculants altered P allocation within the plant,reducing grain P concentration.Conclusion:By testing the microbial inoculants under field conditions, our study clearly shows that themicrobial consortium (AMF+PSB) increased maize productivity, and at the same time improved P use effi-ciency. Further, the use of these microbial inoculants was shown to be compatible with conventionalagricultural management practices.

2021-01Artigo científico

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Entidade financiadora

Fundação para a Ciência e a Tecnologia

Programa de financiamento

3599-PPCDT

Número da atribuição

PTDC/AGR-PRO/1852/2014