Antifungal activity and genetic diversity of selected Pseudomonas spp. from maize rhizosphere in Vojvodina
2012
Antibiotic production by plant-associated microorganisms represents an
environmentally compatible method of disease control in agriculture. However,
a vide application of bacterial strains needs careful selection and genetic
characterization. In this investigation, selected Pseudomonas strains were
characterized by rep-PCR methods using ERIC and (GTG)5 primers, and partial
16S rDNA sequence analysis. None of strains produced homoserine lactones (C4,
C6, C8) as quorum sensing signal molecules. Very poor production of
phenazines and no significant fungal inhibition was observed for PS4 and PS6
strains. High amount of phenazines were produced by Pseudomonas sp. strain
PS2, which inhibited mycelial growth of 10 phytopatogenic fungi in percent of
25 (Verticillium sp.) to 65 (Fusarium equiseti). Genetic characterization of
the Pseudomonas sp. PS2 and evaluation of phenazines production, as the main
trait for growth inhibition of phytopathogenic fungi, will allow its
application as a biosafe PGPR for field experiments of plant disease control.
[Projekat Ministarstva nauke Republike Srbije, br. III 46007: New indigenous
bacterial isolates Lysobacter and Pseudomonas as an important sources of
metabolites useful for biotechnology, plant growth stimulation and disease
control: From isolates to inoculants]
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