Abstract
The use of beneficial fungi and bacteria stimulate plant growth and serve to improve yield and food quality in a sustainable manner. The electrical conductivity of nutrients solution is closely linked to better nutrition of vegetable plants in a hydroponic system. Therefore, objectives of current study were to evaluate the effect of isolated and combined inoculation with Azospirillum brasilense and Trichoderma harzianum under two electrical conductivities on growth, nutrition, and yield of lettuce in hydroponic cultivation. The experiment was designed in a strip-plot block with five replications in a 4 × 2 factorial scheme. The treatments were consisted of four microbial inoculations (without, A. brasilense, T. harzianum and co-inoculation) and electrical conductivities (1.2 and 1.4 dS m−1). Inoculation with A. brasilense and T. harzianum increased lettuce root growth by 47% and 20%, respectively. The single inoculation of T. harzianum provided higher fresh leaves yield (24%) at electrical conductivity of 1.2 dS m−1, while single inoculation with A. brasilense increased fresh leaves yield by 17% at electrical conductivity 1.4 dS m−1. The lowest shoot NO3− accumulation (40%) was observed with inoculation of A. brasilense and highest (28%) with inoculation T. harzianum in both electrical conductivities. Inoculation with A. brasilense increased leaf accumulation of K, P, Ca, Mg, Fe, Mn, Cu, and Zn, which are essential for human nutrition and being recommended to improve yield of lettuce plants in hydroponics. It is recommended to use EC 1.4 dS m−1 of the nutrients solution to improve accumulation of K, Mn, Cu, and Zn, regardless of inoculations for biofortification of lettuce with application of fertilizers.
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The research was funded by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the doctoral studies of second author with a grant number 2020/11621-0, and CNPq productivity research grant (award number 311308/2020-1) of the corresponding author.
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Conceptualization, VAM, CESO, and MCMTF; methodology, CESO, TJSSO, and AJ; software, GHMB and IMBG; validation, VAM, IMBG, VMG, and LSV; formal analysis, GHMB, VMG, and LSV; investigation, CESO and VAM; resources, CESO and MCMTF; data curation, CESO; writing—original draft preparation, VAM and AJ; writing—review and editing, CESO and MCMTF; supervision, MCMTF and CESO; project administration, CESO and MCMTF; funding acquisition, CESO and MCMTF All authors have read and agreed to the published version of the manuscript. Please turn to the CRediT taxonomy for the term explanation. Authorship must be limited to those who have contributed substantially to the work reported.
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Moreira, V.d.A., Oliveira, C.E.d.S., Jalal, A. et al. Inoculation with Trichoderma harzianum and Azospirillum brasilense increases nutrition and yield of hydroponic lettuce. Arch Microbiol 204, 440 (2022). https://doi.org/10.1007/s00203-022-03047-w
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DOI: https://doi.org/10.1007/s00203-022-03047-w