INVESTIGADORES
NESCI Andrea Veronica
artículos
Título:
Impact of two bacterial biocontrol agents on bacterial and fungal culturabel groups associated with the roots of field-grown maize
Autor/es:
PEREIRA, P.; NESCI, A.; ETCHEVERRY, M.
Revista:
LETTERS IN APPLIED MICROBIOLOGY
Editorial:
Blackwell, Synergy
Referencias:
Lugar: Framlington Place (UK) ; Año: 2009 vol. 48 p. 493 - 499
ISSN:
0266-8254
Resumen:
Aims: To assess the impact of Bacillus amyloliquefaciens and Microbacterium
oleovorans on bacterial and fungal groups associated to the roots of field-grown
maize.
Methods and Results: Identification and count of bacterial and fungal culturable
populations associated to the roots of maize seedlings, changes in culturable
community structure according to the richness and diversity indexes
concept and shifts in microbial activity through analysis of cellulolytic, ammonification
and nitrification potentials were determined, in relation to kernel
treatment with biological control agents. Following the treatment of maize kernels
with B. amyloliquefaciens at 107 CFU ml)1, an increase in bacterial diversity
was observed at the rhizoplane of resultant seedlings. Bacterial richness was
significantly increased at the root inner tissues of seedlings treated with Mic.
oleovorans. Fusarium, Aspergillus, Penicillium and Trichoderma were the main
fungal genera isolated and there population sizes were unequally affected by
the addition of biocontrol agents.
Conclusions: Numbers and types of isolated bacteria and fungi changed in
response to the addition of biocontrol agents, while microbial activity remained
unchanged with respect to control.
Significance and Impact of the Study: This study provides an insight of the
effects of proven biocontrol agents on micro-organisms naturally associated to
the target crop.