Abstract
In recent years, certain strains of fluorescent pseudomonads called PGPB have drawn attention due to their abilities to promote plant growth. Therefore, in this investigation, we have explored the adhesive properties, the phytostimulator effects and the biocontrol activities of 40 isolates, with the aim to select potential inoculants to improve crop yields. Ten different colony morphotypes were detected on CRA plates. PsTp172 described as "ST" showed the highest adherence ability to abiotic surface (OD550 = 2.102). 31 isolates were positive for the plant growth-promoting hormone (IAA) production and 30 stains solubilised tri-calcium phosphate in Pikovskaya’s agar. Furthermore, the highest pyoverdine concentration was detected with PsTp172 strain (172.50 µM) under iron starvation conditions. This strain also exhibited a co-resistance against Zn2+ and Mn2+ and displayed high values of Minimum Inhibitory Concentrations (MIC) for each heavy metal. Additionally, among the tested isolates, eight strains (PsS15, PsTp172, PsS28, PsTp171, PsS31, PsS67, PsS18, PsS39 and PsS93) were found to be efficient antagonists against the 3 pathogenic strains and 6 isolates (PsS15, PsTp156, PsTp172, PsC54, PsTp171 and PsS102) were considered as lactone inhibitors of the 3 tested strains, as shown by their ability to inhibit the cellular communication. The majority of isolates showed various phytobeneficial traits and the most effective strains are P. putida (PsTp172 and PsS15) and P. mosseli (PsTp171).
Highlights
In diver’s environments, beneficial plant-associated bacteria exhibit a significant role in plant growth and expression of virulence genes (Compant et al, 2005)
It has been portrayed that certain PGPB are effects of phytopathogenic microorganisms
Among PGPB, fluorescent pseudomonads have proved a boon in sustainable agriculture for use as biofertilizer, biocontrol agent and in bioremediation (Husen et al, 2011)
Summary
In diver’s environments, beneficial plant-associated bacteria exhibit a significant role in plant growth and expression of virulence genes (Compant et al, 2005). Growth Promoting Bacteria (PGPB) is due to their competency, biofertilizer, phytostimulator and efficient colonization of plant roots by forming phytopathogen biocontrol activities (Bloemberg and microcolonies or biofilms which promotes the plant- Lugtenberg, 2001). Of the various rhizospheric bacteria, microbe interaction These bacterial consortiums have the Pseudomonas species are the most popular bacteria that ability to communicate chemically with one another combine all these characters; enhance plant growth by through quorum-sensing (Mishra et al, 2010). Mehri Inès et al / American Journal of Environmental Science 10 (2): 199-209, 2014 fungi, nematode) by the production of siderophores, HCN, antibiotics, bacteriocins, volatile metabolites (Saharan and Nehra, 2011)
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