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Evaluating the impact of the biocontrol agent Trichoderma harzianum ITEM 3636 on indigenous microbial communities from field soils
Author(s) -
Ganuza M.,
Pastor N.,
Boccolini M.,
Erazo J.,
Palacios S.,
Oddino C.,
Reynoso M.M.,
Rovera M.,
Torres A.M.
Publication year - 2019
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/jam.14147
Subject(s) - trichoderma harzianum , biology , trichoderma , temperature gradient gel electrophoresis , biological pest control , inoculation , antagonism , polymerase chain reaction , 16s ribosomal rna , microbiology and biotechnology , veterinary medicine , botany , horticulture , bacteria , gene , genetics , medicine , receptor
Abstract Aim To investigate the impact of inoculating peanut seeds with the biocontrol agent Trichoderma harzianum ITEM 3636 on the structure of bacterial and fungal communities from agricultural soils. Methods and Results Polymerase chain reaction (PCR)‐denaturing gradient gel electrophoresis (PCR‐DGGE) and next‐generation sequencing (NGS) of amplicons (or marker gene amplification metagenomics) were performed to investigate potential changes in the structure of microbial communities from fields located in a peanut‐producing area in the province of Córdoba, Argentina. Fields had history of peanut smut (caused by Thecaphora frezii ) incidence. The Shannon indexes ( H′ ), which estimate diversity, obtained from the PCR‐DGGE assays did not show significant differences neither for bacterial nor for fungal communities between control and inoculation treatments. On the other hand, the number of operational taxonomic units obtained after NGS was similar between all the analysed samples. Moreover, results of alpha and beta diversity showed that there were no significant variations between the relative abundances of the most representative bacterial and fungal phyla and genera, in both fields. Conclusions Trichoderma harzianum ITEM 3636 decreases the incidence and severity of agriculturally relevant diseases without causing significant changes in the microbial communities of agricultural soils. Significance and Impact of the Study Our investigations provide information on the structure of bacterial and fungal communities in peanut‐producing fields after inoculation of seeds with a biocontrol agent.