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Open AccessArticle

A Composite Bioinoculant Based on the Combined Application of Beneficial Bacteria and Fungi

1
Department of Microbiology; Faculty of Science and Informatics; University of Szeged; Közép fasor 52, 6726 Szeged, Hungary
2
Department of Plant Biology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
3
Felső-Bácskai Agrolabor Ltd., Rákóczi Ferenc u. 19., 6430 Bácsalmás, Hungary
4
Department of Field Crops Research, National Agricultural Research and Innovation Centre, Alsó kikötő sor 9, 6726 Szeged, Hungary
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(2), 220; https://doi.org/10.3390/agronomy10020220
Received: 20 December 2019 / Revised: 30 January 2020 / Accepted: 31 January 2020 / Published: 3 February 2020
A composite soil bioinoculant containing beneficial bacteria and fungi was developed for biocontrol of plant pathogens, phosphorous mobilization, stem degradation, humification, and nitrogen fixation. A Trichoderma asperellum isolate with outstanding in vitro antagonistic abilities toward a series of plant pathogenic fungi was included as a potential biocontrol component. The selected strain was also shown to promote growth and increase photosynthetic activity of tomato plants. For phosphorous mobilization and stem degradation, a Trichoderma atrobrunneum strain was selected, which produced cellulose-degrading enzymes even in the absence of stem residues, while this ability increased 10–15-fold in the presence of ground maize stem. The strain was also shown to produce large amounts of enzymes liberating organically bound phosphorous, as well as cellulase and xylanase activities in solid-state fermentation on various plant residues. A Streptomyces albus strain with excellent peroxidase-producing abilities was selected as a potential humus-producing component, while an Azotobacter vinelandii strain with the potential to provide excess nitrogen for crops was included for nitrogen fixation. The assembled soil bioinoculant had positive effect on the uptake of certain important macro- and microelements (potassium, sodium, and manganese) from the soil by field-grown tomato plants. The applied screening strategy proved to be applicable for the assembly of a composite soil bioinoculant with notable application potentials. View Full-Text
Keywords: biocontrol; plant growth promotion; soil inoculant; Trichoderma; Azotobacter; Streptomyces biocontrol; plant growth promotion; soil inoculant; Trichoderma; Azotobacter; Streptomyces
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MDPI and ACS Style

Allaga, H.; Bóka, B.; Poór, P.; Nagy, V.D.; Szűcs, A.; Stankovics, I.; Takó, M.; Manczinger, L.; Vágvölgyi, C.; Kredics, L.; Körmöczi, P. A Composite Bioinoculant Based on the Combined Application of Beneficial Bacteria and Fungi. Agronomy 2020, 10, 220.

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